NNMT is an enzyme that grabs nicotinamide and methylates it, turning it into a waste product called 1-MNA that gets cleared from the body
With around 15% of people failing to get the right levels of Vitamin B12 through their diet alone and with the body unable to produce any for itself, supplements and injections have become a common solution
It is a moot point for me as I do not methylate B12 well without self testing for that reality
Zinc has a role in Cell division, Maintaining the integrity of skin and mucous membranes, hair and hooves and wound healing, Lung function, Bone and cartilage development, Disease resistance, Reproduction/fertility, Spermatogenesis, Placental retention, and Udder function
B12 deficiency is typically treated with B12 supplementation