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Description
Veterinary-Grade Injectable Formula The injectable format allows for efficient delivery of B vitamins when oral supplementation may be inadequate or impractical

Circulation 110 , 16501657 (2004)

How a B12 injection works Vitamin B12, also called cyanocobalamin, is essential for red blood cell production, nerve function, energy metabolism and the synthesis of DNA

The longevity claims are particularly speculative

That doesnt automatically mean trouble