Story
Adaptogens & Medicinal Mushrooms
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In one pass When pressure piles on, the body goes through three steps: it tenses into alarm, holds on in resistance, and collapses when it can hold on no longer. Not this — Adaptogens are plant magic — Real mechanism is dampening cortisol overshoot — a subset of what sleep + exercise + nutrition already do.
Educational content, not medical advice — consult a clinician.
Story path
Chapter 1
Where the adaptogen idea came from
When pressure piles on, the body goes through three steps: it tenses into alarm, holds on in resistance, and collapses when it can hold on no longer. These are the three stages of stress that Selye described. What the adaptogen label sells is keeping you at the resistance step: lift you a little when you are drained, calm you a little when you are wound up, and stop you from sliding into collapse.
The pitch sounds so good that it has been attached to dozens of plants and mushrooms, holding up a large global market. The trouble is that its two core claims, non-specifically raising resistance to stress and bringing the high down and the low up, are almost impossible to measure in people, and just as impossible to disprove. That is why mainstream pharmacology does not treat adaptogens as an established drug class.
This story neither dismisses the whole category nor buys it wholesale; it looks at lion's mane, rhodiola, reishi and cordyceps one at a time. The category also carries real safety problems: ashwagandha has case reports of liver injury, and if your skin or the whites of your eyes turn yellow or your urine turns dark while taking it, stop immediately and seek medical care promptly.
The pitch sounds so good that it has been attached to dozens of plants and mushrooms, holding up a large global market. The trouble is that its two core claims, non-specifically raising resistance to stress and bringing the high down and the low up, are almost impossible to measure in people, and just as impossible to disprove. That is why mainstream pharmacology does not treat adaptogens as an established drug class.
This story neither dismisses the whole category nor buys it wholesale; it looks at lion's mane, rhodiola, reishi and cordyceps one at a time. The category also carries real safety problems: ashwagandha has case reports of liver injury, and if your skin or the whites of your eyes turn yellow or your urine turns dark while taking it, stop immediately and seek medical care promptly.
Background · A word coined in the Soviet Union
The word adaptogen was coined in 1947 by the Soviet pharmacologist Lazarev, building on the three stages of stress that Selye had proposed earlier. The Soviet military and space program ran a large body of research on plants such as rhodiola and schisandra. After the idea reached the Western supplement market in the 1990s, it went mainstream.That is the whole historical backdrop. It explains why the label sounds scientific, but it does not answer the next question: what does an adaptogen actually claim to do inside your body?
Evidence · Why the definition cannot be disproved
The definition Brekhman proposed in 1969 sets out three criteria:1. It non-specifically increases resistance to stress
2. It has a normalizing effect (lowering what is high, raising what is low)
3. It is non-toxic at therapeutic doses
The problem sits inside these three lines themselves. Non-specific is almost impossible to measure precisely in a , and normalizing sounds magical but is hard to falsify in practice: whichever way the result goes, it can be counted as a hit. Mainstream pharmacology does not treat this category as an established drug class precisely because the mechanisms are too mixed and the endpoints too soft.
Myth · The standard marketing script
The marketing of the adaptogen craze follows a fixed script: promotion across TikTok, Instagram and YouTube; the line that natural means safe and effective; a story of holistic, whole-body, traditional wisdom; a pitch that it fights stress, boosts immunity, sharpens focus and slows aging all at once; and a price premium on single products, with combination formulas costing more.A long list of other products also wears the adaptogen label (ginseng, eleuthero (Siberian ginseng), holy basil, schisandra, chaga and more). The names are fancy and the human evidence is thinner still, so this story does not go through them one by one. It accepts that the adaptogen idea has some real history, but judges every product strictly by its evidence: most have little, weak human evidence, a few have several small randomized trials, and almost none has held up in a large trial.
Chapter 2
Can lion's mane regrow nerves?
Lion's mane (Hericium erinaceus) is one of the biggest single products in the adaptogen market of the 2020s, pushed up by TikTok and Huberman together. The pitch is one sentence: it makes nerves in the brain grow back.
It does have a respectable mechanistic starting point. Two groups of compounds in the mushroom (hericenones and erinacines) can, in a dish, make cells produce more of a signal called nerve growth factor (NGF), and NGF's job is to prompt neurons to grow new branches. In animals, some of these compounds reach brain tissue. The chain breaks between animals and people: whether NGF in the human brain rises after eating it has never been measured, and the human trials are only a few small studies.
So it is a textbook case of a plausible mechanism, weak clinical evidence and aggressive marketing. In China and Japan it has traditionally been eaten both as food and as a medicinal mushroom (called yamabushitake in Japan). Eating it as a mushroom has value, but do not pay a premium for anti-dementia claims.
It does have a respectable mechanistic starting point. Two groups of compounds in the mushroom (hericenones and erinacines) can, in a dish, make cells produce more of a signal called nerve growth factor (NGF), and NGF's job is to prompt neurons to grow new branches. In animals, some of these compounds reach brain tissue. The chain breaks between animals and people: whether NGF in the human brain rises after eating it has never been measured, and the human trials are only a few small studies.
So it is a textbook case of a plausible mechanism, weak clinical evidence and aggressive marketing. In China and Japan it has traditionally been eaten both as food and as a medicinal mushroom (called yamabushitake in Japan). Eating it as a mushroom has value, but do not pay a premium for anti-dementia claims.
Evidence · How far the evidence goes
Cell culture and animals: in studies such as Lai 2013, lion's mane extracts stimulated the expression of NGF (and of another neurotrophic factor, BDNF) in cultured nerve cells, with hericenones and erinacines as the main compounds; in animal experiments, these compounds crossed the blood-brain barrier. Mouse models of nerve injury and dementia also show some positive results.Humans: far fewer studies than in animals. Mori 2009 (Phytotherapy Research): 30 Japanese adults aged 50–80 diagnosed with mild cognitive impairment were randomized into two groups of 15. The lion's mane group took 3 g of dried powder a day (4 tablets of 250 mg, three times a day) for 16 weeks. On a cognitive scale based on the Revised Hasegawa Dementia Scale (HDS-R, a cognitive screening scale widely used in Japan), the lion's mane group scored higher than the placebo group at weeks 8, 12 and 16; 4 weeks after stopping, scores fell back significantly. The first author was from a mushroom company. Saitsu 2019 (Biomedical Research): 31 healthy people over 50, in a 12-week randomized, double-blind, placebo-controlled trial. Of three tests (the Mini-Mental State Examination, the Benton visual retention test and a standard verbal paired-associate learning test), only the MMSE reached significance; the two memory tests did not.
Overall: small samples, mostly Japanese studies, much commercial funding. Large randomized trials are missing, and taking it long term to prevent dementia has no supporting evidence at all.
Myth · A natural modafinil?
Modafinil is a prescription drug that works through dopamine, histamine and orexin, and it is a potent wakefulness-promoting drug also used as a cognitive enhancer. Lion's mane works by an entirely different route, and by the mechanism its effect is far weaker than modafinil's (no large head-to-head trial exists). Packaging it as natural modafinil is an overstatement.An honest estimate of what it can offer:
As an aid in mild cognitive impairment in older adults: a signal in one small Japanese trial of 30 people (Mori 2009), with low certainty of evidenceAs a brain booster in healthy people: in one small trial only one screening scale improved, so the evidence is very thinFor preventing dementia: no human dataAs food: nutritional value similar to shiitake and king oyster mushrooms, plus a few distinctive neuroactive compounds
In practice · Dose, form and safety
Dose and form: dried extracts on the market are commonly taken at 500–1500 mg, 2 times a day; the Mori 2009 trial used 3 g of dried powder a day. Tell the fruit body (the mushroom itself) apart from the mycelium (the threads grown in a culture medium): most studies used the fruit body, while many products use mycelium, which is cheaper but lower in hericenones. Quality varies widely, so prefer products with third-party testing.Safety: it is a common food, and the laboratory tests in Mori 2009 showed no adverse effects. People with mushroom allergies should watch for rare allergic reactions; there are no data for pregnancy.
Chapter 3
Rhodiola for stress fatigue
Rhodiola (Rhodiola rosea) is relatively well studied for this category, and its use is the narrowest: it targets fatigue and burnout dragged out by long-term stress, not a quick lift.
Its mechanism is still at the hypothesis stage. It is thought to modulate the hypothalamic–pituitary–adrenal chain of the stress response (the axis), much like ashwagandha, with lighter effects on serotonin (), dopamine (DA), β-endorphin and (the cell's energy sensor). In other words, the idea is that it does not make you more awake; it makes you harder to wring dry.
So rhodiola is natural modafinil is wrong at both ends: the mechanism is different, and so is the strength. Its real place is as an aid for long-term stress, burnout and chronic fatigue. It does not replace treatment for depression, real rest or dealing with the source of the stress itself.
Its mechanism is still at the hypothesis stage. It is thought to modulate the hypothalamic–pituitary–adrenal chain of the stress response (the axis), much like ashwagandha, with lighter effects on serotonin (), dopamine (DA), β-endorphin and (the cell's energy sensor). In other words, the idea is that it does not make you more awake; it makes you harder to wring dry.
So rhodiola is natural modafinil is wrong at both ends: the mechanism is different, and so is the strength. Its real place is as an aid for long-term stress, burnout and chronic fatigue. It does not replace treatment for depression, real rest or dealing with the source of the stress itself.
Background · From Siberia to the Soviet military
Traditional use: a traditional medicinal plant of high-altitude Tibet, the Nordic countries and Siberia. The Soviet military ran a large research program on it between 1947 and 1991 and used it in space and military settings.Main active compounds: rosavins and salidroside. Standardized extracts are often set at about 3% rosavins and 1% salidroside; the one used most in trials is SHR-5.
Evidence · Relatively well studied for its class
Olsson 2009 (Planta Medica): 60 people with fatigue from long-term stress (burnout) took 576 mg of SHR-5 a day for 4 weeks; compared with placebo, the burnout scale and several attention measures improved more (both groups showed a clear placebo effect). Hung 2011 (Phytomedicine), a systematic review: 11 randomized trials, all small and mostly from Eastern Europe and Russia; it concluded that rhodiola may help, but that no single study had been independently repeated. Cropley 2015: 80 people with mild anxiety took 400 mg a day (Vitano) for 14 days; compared with a control group that took nothing (no placebo), self-rated anxiety, stress, anger, confusion and depression fell, and cognitive tests did not differ. The lack of a placebo control is this trial's biggest weakness.This evidence is plentiful by adaptogen standards, but its certainty is still low, and it clusters in three areas: fatigue and burnout from long-term stress; as an aid in mild depression (with inconsistent results: in a head-to-head comparison with sertraline, Mao 2015, rhodiola did not beat placebo); and exercise endurance (some small positive trials).
Dose: 200–600 mg a day of standardized SHR-5, taken in the morning (evening doses may affect sleep); judge the effect after 2–6 weeks.
Safety · How it divides the work with ashwagandha
Safety: most people tolerate it well; high doses can cause insomnia, restlessness and headache; people with bipolar disorder or a history of mania should be cautious (as with ashwagandha); people taking or antidepressants face a theoretical risk of serotonin syndrome (an acute reaction to too much serotonin in the body) and should discuss it with their psychiatrist; in people taking an anticoagulant (warfarin), rhodiola may have a mild effect, so monitoring is needed.How it divides the work with ashwagandha: ashwagandha is usually described as more calming and cortisol-lowering, so it is mostly taken in the evening; rhodiola leans toward alertness and fighting fatigue, so it is mostly taken in the morning. Some people use both, rhodiola in the morning and ashwagandha in the evening; this combination has not been tested in trials.
Chapter 4
What reishi and cordyceps claim
Reishi (Ganoderma lucidum) and cordyceps (Cordyceps sinensis, and the cultivated Cordyceps militaris) are two of the most expensive items in Chinese tradition, and two of modern marketing's favorites. They are really selling two different things.
Reishi sells immunity: the compounds thought to do the work are its β-glucans, triterpenoids and ergosterol, acting at the level of immune cells. Small trials have seen changes in NK cells (immune cells that can directly kill diseased cells) and in cytokines. Note that this is only markers moving, still a long way from the endpoint of you get sick less often.
Cordyceps sells stamina: the compounds thought to do the work are cordycepin and adenosine, acting on energy metabolism, so trials measure endurance and maximal oxygen uptake (), with inconsistent results.
Both sit in the box marked a signal, no verdict. The layer of marketing about anti-aging, anti-cancer, cure-all effects has no high-quality human evidence behind it.
Reishi sells immunity: the compounds thought to do the work are its β-glucans, triterpenoids and ergosterol, acting at the level of immune cells. Small trials have seen changes in NK cells (immune cells that can directly kill diseased cells) and in cytokines. Note that this is only markers moving, still a long way from the endpoint of you get sick less often.
Cordyceps sells stamina: the compounds thought to do the work are cordycepin and adenosine, acting on energy metabolism, so trials measure endurance and maximal oxygen uptake (), with inconsistent results.
Both sit in the box marked a signal, no verdict. The layer of marketing about anti-aging, anti-cancer, cure-all effects has no high-quality human evidence behind it.
Evidence · Reishi's tradition and clinical record
In Chinese tradition reishi is called the herb of immortals, and in Japan mannentake (the ten-thousand-year mushroom); both names tie it to Daoist legends of eternal life. Main active compounds: β-glucans, triterpenoids and ergosterol.Clinical evidence:
Immune modulation: a few small trials (Tang 2005, Gao 2003) show changes in NK cells and cytokinesFatigue and neurasthenia (a randomized trial, Tang 2005): a moderately positive resultAs an aid in cancer treatment: Jin 2016 (Cochrane) found only 5 randomized trials, of poor quality. Compared with chemotherapy or radiotherapy alone, patients who also took reishi seemed to have slightly better tumor response and immune markers, and 4 studies reported better quality of life; none recorded long-term survival. The authors concluded that the evidence is not enough to justify it as a first-line treatment, and that whether it prolongs survival remains uncertainCholesterol and cardiovascular health: a weak signalMarketing claims of all-round anti-aging and anti-cancer effects: no high-quality human evidence
Safety · Reishi's dose and the tumor claim
Dose: 1.5–9 g of dried extract a day (traditional Chinese use goes higher); extracts with 30%+ polysaccharide content are preferred.Safety: generally well tolerated; it may have mild anticoagulant and antiplatelet effects, so be careful if you take warfarin or are about to have surgery; allergies or stomach upset occur occasionally. The trials included in Jin 2016 reported no serious blood or liver toxicity.
On reishi treats tumors: some cancer patients in China use it as an add-on, but it cannot replace chemotherapy, radiotherapy or surgery. The 2016 Cochrane review found that reishi may improve quality of life, but the evidence for a direct anti-tumor effect or longer survival is insufficient.
Evidence · How far cordyceps evidence goes
The traditional form of cordyceps comes from the high mountains of China and Tibet: a natural pairing of a fungus and a ghost-moth larva, and the wild form is extremely expensive. Modern products mostly use cultivated Cordyceps militaris, which is also the main commercial product. Main active compounds: cordycepin, adenosine and polysaccharides.Clinical evidence:
Exercise performance (endurance and maximal oxygen uptake): a few small trials (such as Hirsch 2017, J Diet Suppl) show a signal, but the results are inconsistentFatigue and sexual function: weak evidenceKidney protection (chronic kidney disease): some traditional Chinese medicine research; weak evidence elsewhereAnti-aging, anti-tumor, cure-all: marketing claims, without high-quality human evidence
Dose: 1–3 g a day of standardized extract. Safety: the cultivated form is generally safe; the wild form carries warnings about heavy-metal contamination; people with autoimmune disease should be aware of the risks of its effects on the immune system.
Myth · Is wild better? Are blends stronger?
The claim that wild cordyceps is more magical needs unpacking. Wild Cordyceps sinensis is extremely expensive, carries a serious risk of heavy-metal contamination (arsenic, cadmium), and is partly restricted by Chinese regulators. Cultivated Cordyceps militaris is cheap and standardized, has similar active compounds, and is the form actually used today. No trial shows the wild form works better, and its contamination risk is higher.Blends of cordyceps and reishi: blends are common in traditional Chinese medicine and health products, but the clinical evidence for each ingredient alone is weak, no large randomized trial supports any combined synergy, and the price premium is large, so combination formulas are not recommended.
Chapter 5
Should you buy? Three questions
First, the strongest point: none of the things that actually make the body more resilient to stress come in a bottle.
Exercise is real adaptation to stress; sleep is real repair of the axis; mindfulness and cognitive behavioral therapy () are a real reset for stress; saunas and cold exposure work through hormesis, trading small doses of stress for adaptation; eating less ultra-processed food and following a Mediterranean-style pattern pushes chronic inflammation down; and social life and relationships count too. These are the true adaptogens with strong evidence, far better supported than any plant or mushroom extract, and they cost almost nothing.
A bottled adaptogen's reasonable place comes after all that: only once the basics are in place and there is room left, and only if you are willing to take it at the doses used in trials for a full round (8–12 weeks) and then judge it objectively. Not I am stressed, so I take X; that is using a supplement to dodge the real problem.
Exercise is real adaptation to stress; sleep is real repair of the axis; mindfulness and cognitive behavioral therapy () are a real reset for stress; saunas and cold exposure work through hormesis, trading small doses of stress for adaptation; eating less ultra-processed food and following a Mediterranean-style pattern pushes chronic inflammation down; and social life and relationships count too. These are the true adaptogens with strong evidence, far better supported than any plant or mushroom extract, and they cost almost nothing.
A bottled adaptogen's reasonable place comes after all that: only once the basics are in place and there is room left, and only if you are willing to take it at the doses used in trials for a full round (8–12 weeks) and then judge it objectively. Not I am stressed, so I take X; that is using a supplement to dodge the real problem.
In practice · Question 1: what are you trying to fix
Question 1: what is your goal? Different goals point to completely different products.Chronic stress and burnout: rhodiola has the most small-trial signals, and ashwagandha also has several small randomized trials (the Ashwagandha story covers it in detail). Pick one and try it for 6–8 weeksAn aid for mild depression: rhodiola's results are inconsistent, and it cannot replace an or psychotherapyCognition and memory: lion's mane has only one or two small Japanese trials; try it for 12 weeks, and expect far less than from exercise, sleep and dietImmune modulation or support in chronic disease: reishi's evidence is weak; if you use it alongside standard treatment, tell your doctorExercise endurance: cordyceps's signal is weak, so do not expect a large effectAnti-aging and longevity: no adaptogen meets this bar, so do not buy for it
In practice · How to try one, how to read the ads
Question 2: how do you actually use them?Try one at a time and avoid blends; otherwise you cannot tell which one is doing the workEvaluate at 2–8 weeks: note how you feel, and you can also track a stress scale and a fatigue scalePrefer products with third-party quality certification (USP, NSF, Eurofins)Prefer standardized extracts over whole powder or full-spectrum products
Question 3: how should you read the marketing?
Adaptogens regulate everything: the idea is too vague; each real product does something narrowHolistic wisdom, ancient tradition: a long history is not the same as strong modern evidenceNatural means safe: wrong. Natural products can injure the liver and interact with drugs too, as the ashwagandha liver-injury cases showGentler than drugs and just as effective: the gentle part is sometimes true; the just-as-effective part mostly does not holdFights dementia, tumors and viruses all at once: grossly overstatedBlended formulas work in synergy: almost no large randomized trials support this
Evidence · Three of the better-studied adaptogens
Adaptogen is a very broad category, and only a handful of products have evidence from randomized trials. Here are three of the better-studied ones side by side.① Rhodiola (Rhodiola rosea): a few small randomized trials, low certainty of evidence
Main active compounds: rosavin and salidrosideOlsson 2009, an SHR-5 randomized trial (chronic fatigue from stress, 60 people): 576 mg a day for 4 weeks, with less fatigueDose: 200–600 mg a day (in the morning)Suited to: stress-related fatigue and work pressureNot suited to: bipolar disorder (may trigger mania) and pregnancy
② Ashwagandha (sometimes called Indian ginseng): a few small randomized trials, low-to-moderate certainty of evidence
Main active compounds: withanolides, sold in proprietary extracts such as KSM-66 and SensorilChandrasekhar 2012, a stress trial: 64 adults with a history of chronic stress took 600 mg a day (300 mg twice a day) for 60 days; serum cortisol fell 27.9% from baseline, against 7.9% in the placebo groupSalve 2019: stressed healthy adults over 8 weeks; stress scores and serum cortisol fell, and self-rated sleep quality improvedAmbiye 2013, a trial in men: men with low sperm counts took 675 mg of root extract a day (225 mg three times a day) for 90 days; serum testosterone rose 17% (4.45 → 5.22 ng/mL). This was a small pilot studyDose: 300–600 mg a dayWarning · liver injury: two published case series — 5 cases from Iceland and the US Network (Bjornsson 2020) and 23 from India (Philips 2023) — both predominantly cholestatic, onset mostly 2-12 weeks in. Most were self-limited, but people with pre-existing chronic liver disease have had severe, including fatal, outcomes. Monitor liver enzymes if you use it; do not use it with a liver history. If your skin or the whites of your eyes turn yellow, your urine darkens, your skin itches or you feel persistently exhausted while taking it, stop immediately and seek medical care promptlyNot suited to: pregnancy (risk of miscarriage), autoimmune disease and hyperthyroidism
③ Ginseng (Panax ginseng): a few small randomized trials, mixed results
Red ginseng, American ginseng and notoginseng (different species)Main active compounds: ginsenosides (Rb1, Rg1)Reay 2005, a randomized trial: a single 200 mg dose improved performance on sustained mental arithmetic and lowered blood glucose after a mealKim 2013, a randomized trial in chronic fatigue: 1–2 g a day for 4 weeks; the total fatigue score did not beat placebo, but the mental-fatigue subscale and the VAS fatigue score in the 2 g group improved significantly (P < 0.01)Vuksan 1999–2008: American ginseng taken before meals lowered blood glucoseDose: 1–3 g a day of red ginseng powder, or 200–400 mg of a standardized extractCaution: it may raise blood pressure (individual responses vary widely) and affects (the clotting measure used with warfarin)
Comparison table (note on the table: the usual trial period is how long to give it in practice before judging, not a proven time to effect):
| Rhodiola | Ashwagandha | Ginseng | |
|---|---|---|---|
| Best-studied areas | Stress and performance | Anxiety, sleep, testosterone | Fatigue, older adults, blood glucose |
| When to take it | Morning | Evening, with food | Morning |
| Usual trial period | 1–2 weeks | 4–8 weeks | 2–4 weeks |
| Pregnancy | Avoid | Strictly avoid | Avoid |
A few with weaker evidence and more commercial hype: cordyceps (inconsistent trial results), reishi (some signal as an aid in cancer care, but a weak claim to the adaptogen label), astragalus (a qi tonic in traditional Chinese medicine, with weak modern evidence) and blended adaptogen formulas (mostly diluted).
In practice:
Stress and performance: rhodiola 200 mg in the morning, tried for 1–2 weeks firstAnxiety and sleep: ashwagandha 300 mg in the evening, tried for 6–8 weeksChronic fatigue in older adults: red ginseng 1–2 g in the morning, tried for 2–4 weeksIf there is no effect after 3 months, stop; do not keep goingPregnancy, breastfeeding, bipolar disorder, autoimmune disease and liver disease: avoid all of them
Safety · Cautions for every adaptogen
The following holds for all adaptogens:Pregnancy and breastfeeding: most lack data, so skip themBipolar disorder or a history of mania: some may trigger or worsen itTaking an , or MAO inhibitor: a theoretical risk of serotonin syndrome (an acute reaction to too much serotonin in the body)Taking an anticoagulant (warfarin or a direct oral anticoagulant, ): some adaptogens have antiplatelet effects or affect clottingStop 1–2 weeks before surgeryAutoimmune disease (rheumatoid arthritis, lupus, Hashimoto's thyroiditis): some adaptogens stimulate the immune system, so be cautiousLiver disease: ashwagandha has case reports of liver injury, so do not use it
In practice · Is the money well spent
On value for money: ashwagandha and rhodiola both cost a fair amount each month, and the same money spent on a course or app, a gym or nutrition counseling usually pays back more. The most expensive supplement is the best is usually a marketing premium; the quality of the standardized extract matters more.To keep reading: the Ashwagandha story covers the axis and cortisol, and stress metabolism, sleep and circadian rhythm, mental health and exercise, and other brain-boosting supplements each have their own stories on the site.
Overall, the adaptogen field does include a few products backed by small randomized trials, but its marketing as a whole runs far ahead of the evidence. This story sells neither panic nor perfection: judge each product by its evidence, get the basics right first, and consider a supplement only if there is room left.
References · 15
- Panossian, A., & Wikman, G. (2010). Effects of adaptogens on the central nervous system and the molecular mechanisms associated with their stress-protective activity. Pharmaceuticals, 3(1), 188-224. 10.3390/ph3010188
- Björnsson, H. K., Björnsson, E. S., Avula, B., Khan, I. A., et al. (2020). Ashwagandha-induced liver injury: A case series from Iceland and the US Drug-Induced Liver Injury Network. Liver International, 40(4), 825-829. Five cases of cholestatic/mixed liver injury after 2-12 weeks of ashwagandha use; all self-limited. 3 cases from Iceland (2017-2018) and 2 from the US DILIN (2016); mean age 43; jaundice after 2-12 weeks; cholestatic or mixed injury; pruritus and hyperbilirubinaemia lasted 5-20 weeks; no hepatic failure; liver tests normalized in 1-5 months in 4 (1 lost to follow-up); chemical analysis confirmed ashwagandha with no other toxic compound; 4 were also taking other supplements (rhodiola possibly co-causal in one). Full text: the Icelandic daily doses were 450-1350 mg as recorded from the label, and no patient had recently raised the dose (abstract, PMID 31991029; full text, PMC8041491). pubmed.ncbi.nlm.nih.gov/31991029
- Philips, C. A., Valsan, A., et al. (2023). Ashwagandha-induced liver injury — A case series from India and literature review. Hepatology Communications, 7(10), e0270. 23 herb-induced liver injury cases; cholestatic predominant; patients with pre-existing chronic liver disease had severe (fatal) outcomes. Retrospective multicentre Indian series, January 2019 to December 2022: of 23 patients with ashwagandha liver injury, the 8 on single-ingredient products are reported in detail (multiherbal or co-hepatotoxic exposures excluded); mostly men, cholestatic hepatitis commonest; 5 had underlying chronic liver disease, 3 of them presented with acute-on-chronic liver failure and all 3 died; the other injuries were prolonged but self-limiting, one became chronic. Chemical analysis found only natural phytochemicals, no adulteration or contamination. Full text: patients took ashwagandha per practitioner advice or product labeling (abstract, PMID 37756041; full text, PMC10531359). 10.1097/HC9.0000000000000270
- Mori, K., Inatomi, S., Ouchi, K., Azumi, Y., & Tuchida, T. (2009). Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytotherapy Research, 23(3), 367-372. 10.1002/ptr.2634
- Saitsu, Y., Nishide, A., Kikushima, K., Shimizu, K., Ohnuki, K. (2019). Improvement of cognitive functions by oral intake of Hericium erinaceus. Biomedical Research, 40(4), 125-131. Three tests: MMSE, Benton visual retention, S-PA verbal paired-associate. ONLY the MMSE reached significance — the two memory tests did not. The story used to print the reverse. Full text: 34 randomized, 31 analysed (16 on H. erinaceus, 15 on placebo), all over 50; four supplements a day, each with 0.8 g powdered fruiting body, for 12 weeks (full text, Biomedical Research 40(4); abstract, PMID 31413233). 10.2220/biomedres.40.125
- Lai, P.-L., Naidu, M., Sabaratnam, V., Wong, K.-H., David, R. P., Kuppusamy, U. R., et al. (2013). Neurotrophic properties of the Lion's mane medicinal mushroom, Hericium erinaceus from Malaysia. International Journal of Medicinal Mushrooms, 15(6), 539-554. Cell culture only (NG108-15 neuroblastoma-glioma cells; MRC-5 fibroblasts for toxicity): an aqueous H. erinaceus extract was not cytotoxic, induced NGF secretion and neurite outgrowth, and together with 10 ng/mL NGF gave the largest outgrowth (+60.6%); it failed to protect the cells against oxidative stress, so the authors call it neurotrophic but not neuroprotective. It measures no BDNF, no blood-brain-barrier passage and no animals, which this record once claimed (abstract, PMID 24266378). 10.1615/IntJMedMushr.v15.i6.30
- Olsson, E. M., von Schéele, B., & Panossian, A. G. (2009). A randomised, double-blind, placebo-controlled, parallel-group study of the standardised extract SHR-5 of the roots of Rhodiola rosea in the treatment of subjects with stress-related fatigue. Planta Medica, 75(2), 105-112. 10.1055/s-0028-1088346
- Hung, S. K., Perry, R., & Ernst, E. (2011). The effectiveness and efficacy of Rhodiola rosea L.: a systematic review of randomized clinical trials. Phytomedicine, 18(4), 235-244. Eleven placebo-controlled RCTs met inclusion: 6 on physical performance, 4 on mental performance, 2 in diagnosed mental-health conditions. Methodological quality mostly moderate or good, and only a few mild adverse events. ⚠️ The conclusion is deliberately weak: R. rosea MAY have beneficial effects, but there is a LACK OF INDEPENDENT REPLICATION of the individual studies and more research is warranted. Do not cite this review for consistency of effect — non-replication is its main finding. 10.1016/j.phymed.2010.08.014
- Mao, J. J., Xie, S. X., Zee, J., Soeller, I., Li, Q. S., Rockwell, K., & Amsterdam, J. D. (2015). Rhodiola rosea versus sertraline for major depressive disorder: a randomized placebo-controlled trial. Phytomedicine, 22(3), 394–399. 10.1016/j.phymed.2015.01.010
- Jin, X., Ruiz Beguerie, J., Sze, D. M.-Y., & Chan, G. C. F. (2016). Ganoderma lucidum (Reishi mushroom) for cancer treatment. Cochrane Database of Systematic Reviews, (4), CD007731. 10.1002/14651858.CD007731.pub3
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