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Its administered into the upper arm (deltoid muscle) by one of our qualified pharmacists or trained pharmacy technicians

This means that B12 injections can rapidly increase B12 levels in the body, providing quicker results for athletes

However, consuming particularly high doses of vitamin B12that is, more than the recommended 2.4 micrograms per daycan cause side effects headaches, fatigue, weakness, and tingling in extremities to gastrointestinal symptoms such as diarrhea, nausea, and vomiting

How does it help with fat loss

Both forms are well tolerated

Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem