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A smaller number indicates a larger needle and a larger number indicates a smaller needle
B12 injections are especially useful for people with a B12 deficiency, which tends to stem from difficulties absorbing the nutrient, not falling short nutritionally, says Foxx
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It determines how deep the needle penetrates into the muscle tissue
The right needle helps the dose reach the right layer of tissue, keeps the injection comfortable, and lowers the small risks that come with any injection
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