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Vitamin B12 injections may enhance your performance in the gym by boosting your energy and your muscle growth

If you have kidney disease, very high doses of vitamin C might result in kidney damage

B12 (typically cyanocobalamin or methylcobalamin) is placed directly into the muscle, so it is reliably absorbed into the bloodstream and carried to the cells that need it

Updated 2 July 2026

The compound is most often taken with meals, as this may improve absorption and reduce the likelihood of gastrointestinal discomfort

Each vial contains sterile water with 0.9% benzyl alcohol , which acts as a preservative to maintain sterility and allow for multiple withdrawals