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what's the difference between b12 injections and b12 pills vs Oral Supplements: Which are more effective? The Advantages of B12 Injections
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The first injection almost always causes nausea, which goes away after a few doses

References [edit] "Inorganic Cyanide as Protecting Group in the Stereospecific Reconstitution of Vitamin B 12 from an Artificial Green Secocorrinoid" (PDF)
& Hahm, K

Preclinical studies in mice demonstrate significant reductions in fat mass and body weight without changes in food intake
