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Description
Dietary deficiency of Vitamin B12, occurring in strict vegetarians and in their breast-fed infants

Nutrients 14, 4350

But, again, its not that simple and theres no evidence to suggest that methylcobalamin is better than adenosylcobalamin at helping to reduce homocysteine

Health and Safety

Komatsubara S, Mori S, Mashiba T, Nonaka K, Seki A, Akiyama T, et al
