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Key Takeaways Vitamin B12 is vital for neurological function and DNA synthesis

At this performance-focused tier, doses of 5-10 mg before training sessions, three to five times per week, represent the upper range of current clinical practice [2]

Potential drug interactions Lack of comprehensive study of the peptides on PCACs list means that the potential for and severity of drug interactions are not well understood

Hair grows slowly (about half an inch per month), so it may take a while to see significant improvements

For subcutaneous B12 injections, a needle with a gauge of 25-27 and a length of 3/8 to 5/8 inch is commonly used

Rotate injection sites to minimize irritation