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C (Comparison): intramuscular administration of Vitamin B12
Yes, B12 plays a role in cell production and repair, which contributes to healthier hair growth, stronger nails, and clearer skin
A peer-reviewed study by the National Institutes of Health shows that B12 absorption depends on the presence of intrinsic factors in the stomach
Rare Complications and Contraindications Even though its rare, serious problems can happen with Vitamin B12 shots
As such, even when a deficiency is present, it doesnt seem to negatively impact hair growth
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