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PMID 21030672

AHK-Cu in the context of other hair growth peptides The peptide landscape for hair growth extends beyond copper peptides

In a randomized, placebo-controlled intervention study with more than 900 older participants experiencing psychological distress, daily supplementation with folic acid (400 g) and vitamin B 12 (100 g) for two years did not reduce the occurrence of symptoms of depression despite significantly improving blood folate, vitamin B 12 , and homocysteine levels compared to placebo (109)

A nuance worth stating plainly: the strict "oral = gut only, injection = everything else" dichotomy is a simplification

In individual cases, high doses of vitamin B6, i.e