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These are the coenzyme forms of B12 that are active in humanmetabolism

AOD-9604 from unregulated online vendors is often under-dosed, contaminated or completely fake

You can also get vitamin B-12 deficiency if you follow a vegan diet (meaning you dont eat any animal products, including meat, milk, cheese, and eggs) or you are a vegetarian who doesnt eat enough eggs or dairy products to meet your vitamin B-12 needs

Taniki N, Nakamoto N, Chu PS, Mikami Y, Amiya T, Teratani T, Suzuki T, Tsukimi T, Fukuda S, Yamaguchi A, Shiba S, Miyake R, Katayama T, Ebinuma H, Kanai T (2018) Intestinal barrier regulates immune responses in the liver via IL-10-producing macrophages