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Description
[DOI] [PMC free article] [PubMed] [Google Scholar] 29.Vitamin B12 supplementation in treating major depressive disorder: a randomized controlled trial

Therefore, when you are deficient in B12, MMA levels increase in the blood and urine

In general: Take your thumb and index (pointer) finger and pinch the skin

But as far as humans go, high-quality studies are still needed to confirm if vitamin B-12 injections can actually contribute to weight gain
