Medically reviewed by Alan Lucks | MD , Alan Lucks MDPC Private Practice - New York on March 29th, 2026
Vitamin B12 is a nutrient that your body doesn't make, so you have to get it from animal products, such as meats, dairy, and eggs, or from supplements
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The safest foundation for muscle growth is consistent strength training, adequate protein, sleep, recovery, and medical evaluation when progress is limited
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