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While dietary sources and oral supplements can provide vitamin B12, they may not be effective for everyone
This makes it a highly targeted tool for metabolic research
If you have a friend or loved one to help you, the upper buttocks or the arm are a good choice
[1] For example, if a 2 mL dose (full 200 mg thiamine, 200 mg niacinamide) is to be given IV, a nurse might mix it into 50 mL of saline and infuse over 15-30 minutes
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