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As an illustration, it has been shown to counteract tumor-induced muscle cachexia and the signaling process implicated in cancer cachexia [10] and leaky gut [11], as well as its membrane stabilizing and free radical scavenging activities (for review see, [10,11])

It is an intracellular metabolic-enzyme modulator, which is why its research read-outs are things like NAD+ levels and adipocyte gene expression, not how full you feel. That mechanistic distinction is the single most important thing to understand before looking at any dose number

Some side effects that may be seen after injectable B12 are: mild diarrhea itching or rash nausea and vomit headache swelling venous thrombosis pulmonary edema or congestive heart failure allergic reaction or anaphylaxis (rare) Caution : Vitamin B12 in the form of cyanocobalamin (found in most dietary supplements) should be avoided by people with Lebers disease (hereditary optic neuropathy), as it can cause severe atrophy of the optic nerve (10)

The body produces a similar substance in small quantities to protect and heal the gut lining

doi: 10.3109/10715769509147544