Ashwagandha · Withania somnifera

南非醉茄 · Ashwagandha

Place · Level 3

印度阿育吠陀 3000 年 · 适应原概念代表 · 皮质醇 RCT 证据 B 级 · 提取物形式差异巨大

Connected to · 4

regulates · 1

Insomnia
The third axis is the HPA: chronically high cortisol makes sleep onset hard and sleep light. Ashwagandha is sold against exactly that axis, as an adjunct — any of the three axes (sleep pressure, clock, stress) can cause insomnia, so first work out which one.

contrast · 3

Adaptogens & Mushrooms
Adaptogen is a category label, not a mechanism: the term comes from a Soviet-era research tradition for herbs said to help the body withstand stress. Ashwagandha is the best-evidenced member, but mechanisms and evidence vary widely across the category and do not transfer between members.
Fenugreek
Two herbs sold from the same 'raise testosterone' shelf and routinely compared, on quite different mechanisms: fenugreek's evidence sits mostly in libido with weak testosterone numbers, while ashwagandha's modest rise comes indirectly via lower cortisol and better sleep — and carries a real DILI risk. Seeing them together is what shows they are not interchangeable.
Depression & Anxiety
Chronic stress keeps cortisol high, damaging the hippocampus and blunting HPA feedback. Ashwagandha is sold against exactly that axis, but it is an adjunct signal, not first-line care for depression or anxiety.

3000 yr Ayurveda

Stop 1/5

3000 年印度阿育吠陀

The name Ashwagandha comes from Sanskrit, combining 'horse smell' and 'strength of a horse'.

Foundational facts:

Latin name Withania somnifera, a Solanaceae shrubThe main medicinal part is the root; leaves and berries have different traditional uses and safety profiles3000 years of Ayurvedic use, in India, Nepal, and South AsiaAyurveda classifies it as a rasayana (rejuvenator / adaptogen), traditionally used to improve vitality, sexual function, memory, and longevity
On the concept of adaptogen, introduced by Soviet pharmacologist Lazarev in 1947 and systematized by Brekhman + Dardymov in 1969, with three defining features:

1. Non-toxic at normal doses
2. Non-specific — effective against multiple stressors
3. 'Normalizing' action — returns the body to homeostasis, whether starting from too high or too low

Classic adaptogens typically listed: ashwagandha, rhodiola, ginseng, cordyceps, holy basil, schisandra. The word has no formal FDA/EMA recognition and lives mostly in marketing and integrative medicine, but some of these plants do have RCT evidence — ashwagandha is among them.

Main active compounds

Withanolides: a class of steroidal lactones, ashwagandha's main pharmacologically active substance. Most-studied are withaferin A, withanolide A, withanone. Chemical structure resembles glucocorticoids, so partial effects may go through GR (glucocorticoid receptor) modulation; also acts on GABA / dopamine / serotonin systemsWithanosides: glycosylated withanolidesAlkaloids: trace amounts, used as a sedative in ancient India
Root vs leaf

Traditional use and most RCTs use root, because root has high withanolide content and few alkaloid impurities. Leaf extracts have higher withaferin A but also more cytotoxicity; some commercial products mix leaf and root, possibly explaining some adverse event reports. KSM-66, Sensoril and other proprietary extracts are standardized — see the next scene.

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Educational content, not medical advice — consult a clinician.

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