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Higher doses and the injectable forms require a prescription

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

It can lower blood sugar levels

Higher doses do not necessarily produce better results and may increase the risk of side effects like headaches or gastrointestinal discomfort without improving fat loss outcomes

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