Vitamin B12 has a very low risk of toxicity, so there's really no upper limit to how much you can take without harm
A double blind, placebo-controlled, parallel design study suggested that melatonin supplementation enhanced sleep onset and sleep quality in subjects
Damaging oxygen free radicals are increased by the presence of metallic elements and act as a chronic irritant to blood vessel walls and cell membranes
doi: 10.1126/science.aal3535 52 DivakaruniASHsiehWYMinarrietaLDuongTNKimKKODesousaBRet al
Effects on pineal gland function Epitalon exerts direct influence on the pineal gland and melatonin synthesis
The reaction mixture was retrotranscribed at 48 C for 45, denatured for 2 at 94 C and then subjected to 1826 cycles of denaturation for 30 seconds, annealing at 55 C for 45 seconds, and elongation at 68C for 1 minute