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Use insulin syringes with 29 to 31 gauge needles for subcutaneous injection
Vitamin B12 Why it matters: Found naturally in animal foods, vitamin B12 regulates key metabolic processes in the body both directly and as a cofactor (or "helper molecule") for two enzymes (methionine synthase and L-methylmalonyl-coenzyme A mutase)
L., Moots, R
Improved mood Vitamin B12 supplements may improve mood and ease depressive symptoms
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