Marketing them for human use is unlawful
A single-center randomized controlled trial of local methylcobalamin injection for subacute herpetic neuralgia
So, via the folate and methionine cycles working together, the potentially negative metabolite homocysteine is recycled to produce a new supply of SAMe, promoting methylation
Gyurkovics M, Lohinai Z, Gyorfi A, et al
However, there are exceptions: PT-141 (Bremelanotide) : This peptide is used for sexual function in both men (ED) and peptides for women (Hypoactive Sexual Desire Disorder)
Even worse, with lower levels of stomach acid comes the perfect breeding ground for gut bacteria that consume your bodys limited supply of vitamin B12