Some people have trouble absorbing B12
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The decision to place the products on the FDA's official list for compounding doesn't come close to the standards for drug approval, but some worry that nuance will not be clear to the public, which may not be aware of the limited data for humans
Initial administration of the needle may cause slight discomfort, but should never be overly painful
B12 injections are concentrated doses of vitamin B12, a key nutrient that plays a critical role in how your body creates energy, metabolizes fat, and supports brain and nerve function