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High-dose B12 therapy is usually safe
Research shows that 4 mm needles are effective, less painful, and carry no risk of penetrating muscle tissue, even in lean people
We use cyanocobalamin , the form of vitamin B12 with the longest clinical history, the most extensive research backing its safety, and the consistent potency required for repeated treatments
Anything higher than that quickly becomes too much volume for one subQ site, which is why oral capsules are the standard route
References Abdelwahab, Omar Ahmed, et al
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