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contrast · 2
These two herbs sit on the same "boost testosterone" shelf and get compared, but their mechanisms are completely different: the evidence for fenugreek is mostly about libido, with weak testosterone data, while ashwagandha's small rise comes indirectly from lower cortisol and better sleep, and there are case reports of liver injury. Seen side by side, they are clearly not substitutes for each other.
≠Zinc
Two rows of the same comparison table, opposite in kind: zinc raises testosterone only in people who are deficient and does nothing once they are replete, a narrow but solid use, while fenugreek is a broad claim with weak evidence. Side by side, they show that before saying something works, you have to ask who it works for.