Stacking Semax, PE-22-28, and Selank simultaneously would drive BDNF elevation through three different mechanisms, and there is such a thing as too much BDNF
Sources: Newsome, Philip N., et al
Deficiencies in vitamin B12 can lead to neurological complications, including peripheral neuropathy, cognitive decline, and psychiatric diseases such as depression and psychosis ( 8 Conclusion Deficiencies in complex B vitamins, particularly vitamins B9 (folate) and B12 (cobalamin), have significant neuropsychiatric manifestations that can profoundly impact mental and neurological health
However, copper peptides are gentler on the scalp and less likely to cause irritation or dryness
Until real evidence says otherwise, the default assumption must be that such risks could exist
A research use only label does not make a product legal to use