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Description
Science 334 , 12781283 (2011)

Supplementing B12 can lower homocysteine, an amino acid in your bloodstream
They are simply not the same kind of thing

B-12 injections are very safe with no major side effects.

There is a significant increase in the incidence of allergic and autoimmune diseases, such as asthma, atopic dermatitis, allergic rhinitis, chronic sinusitis, food allergies, celiac disease and inflammatory bowel disease

Mitochondrial therapies are becoming increasingly important in modern longevity medicine
