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A: Key biomarkers include body weight, fat mass, glucose and insulin levels, and markers related to NAD+ metabolism

Injections have better bioavailability than oral supplements as they bypass the digestive system completely, providing a direct supply of B12 into the bloodstream to fuel your body

This was because hydroxocobalamin produced by bacteria was changed to cyanocobalamin during purification in activated charcoal columns after separation from the bacterial cultures (because cyanide is naturally present in activated charcoal)

These vitamins have other biological functions