Pharmacognosy intro
Tribulus contains steroidal saponins (protodioscin as primary, protogracillin, terrestrosin A-E, dioscin, diosgenin, furostanol and spirostanol glycosides); flavonoids (quercetin, kaempferol, isorhamnetin glycosides); β-carboline alkaloids (harmane, norharmane with MAO inhibition properties); phytosterols (β-sitosterol, stigmasterol); and lignanamides (terrestriamide, N-trans-caffeoyltyramine). The proposed mechanism of protodioscin converting to DHEA is POORLY SUBSTANTIATED in human studies. Multiple well-designed RCTs have FAILED to demonstrate significant testosterone elevation in healthy men, this is the critical pharmacognosy truth that marketing obscures. What IS supported: improved erectile function via nitric oxide (NO) pathway (protodioscin releases NO from endothelium, similar to PDE-5 mechanism), improved subjective libido (possibly NO-mediated or central via β-carboline alkaloid effects), and diuretic/lithotriptic effects (stone-dissolving, aligning with traditional Ayurvedic use as Gokshura). Mild adaptogenic effects exist but are weaker than classical adaptogens.