The problem with natural vegan food sources of B12 is that they contain inactive forms of the nutrient
Structure 18 , 246256 (2010)
There are other synthetic peptides that have not been well tested, often because early studies found they were not effective or are potentially toxic
Despite being water soluble, vitamin B12 is stored in the liver in substantial amounts (25 mg) that can sustain normal function for 35 years
Some peptides are used in safety-tested, widely sold creams, serums, and moisturizers, which may help with skin texture
It is recommended that the maximum duration is 2 months then taking the same duration off, so 2 months on, 2 months off