Melatonin
Sleep support & circadian rhythm
Hormones: 31 compounds are used here, 13 of them at evidence level A. The most used is Melatonin. Between them there are 157 documented interactions — which is why the order and timing of a stack matters as much as the choice.
Sleep support & circadian rhythm
Neurotransmitter & hormone support
Neurotransmitter & hormone support
Thyroid hormone production
Natural testosterone support
By usage and evidence: Melatonin, Vitamin B6 (Pyridoxine HCl), Vitamin B6 (P5P). 13 compounds here carry evidence level A, meaning the effect was studied directly rather than inferred.
There is no fixed limit, but every added compound multiplies possible interactions. The compounds on this page have 157 documented interactions between them — check a pair before stacking it.
Depends on the compound. Each page lists first effects and peak benefit windows separately, because the two differ by weeks for most compounds.