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The best needle for B12 injection into fat tissue would be within the 4-5 mm size range, combined with a gauge of 30G or higher
Shorter needles are much safer and are better tolerated and less painful
Many people first think about buying vitamin B12 supplements, but some patients prefer injections or are advised that injections may be more suitable
Storage: Store below 25C and protect from light
Part of a medically supervised protocol for patients working on body recomposition
Cleveland Clinic
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