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It supports protein synthesis and thus the growth, as well as the synthesis of DNA and RNA

You also get vitamin B12 in eggs, dairy, and foods fortified with this nutrient

While not required, a calorie deficit with adequate protein (0.7 to 1.0 grams per pound of goal weight) produces best results

It is found in some animal meats naturally

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Individuals with certain medical conditions or allergies should exercise caution