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In a 24-week follow-up study, the authors concluded that the benefit of this treatment persisted for several weeks beyond the last application (Kirsner 2013)

No high-quality clinical trial has demonstrated that B12 injections produce meaningful weight loss independent of dietary and exercise changes

Possible temporary reactions include: Mild soreness at the injection site Nausea, headache or dizziness for a day or two Occasional minor bruising Serious side effects are very rare

That leaves it prone to mislabeling, contamination, and inconsistent purity

Since the mid-1950s, scientists have also been aware of the ability of B12 to process and burn fat