It's a relatively high amount for a supplement to have, but it shouldn't be a problem for most people since the maximum per-day allowance for adults is 400mcg.34 That said, you may want to avoid Doctor's Best Glutathione + Milk Thistle if you take another supplement that includes selenium or eat a lot of selenium-rich foods (e.g., Brazil nuts, tuna)
A deficiency of vitamin B12 often occurs when dietary intake is insufficient or when the body has issues with absorbing vitamin B12
The human tri-peptide GHK-Cu in prevention of oxidative injury and tissue remodeling.
Biomedicine & Pharmacotherapy .
However, they are still essential in supporting your brains overall health
[DOI] [PMC free article] [PubMed] [Google Scholar] 93.Yang W., Cai X., Wu H., Ji L