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Herrmann W, Obeid R
Adults usually get 1000 mcg (1 mL) of Vitamin B12
Every body is different
[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
On rare occasions, some people can suffer an immune reaction to vitamin B12 shot ingredients, but this is more likely if you have autoimmune conditions
42 Another RCT studied cyano-B12, 1500 g three times per day for 2 weeks (route not reported), in patients with seasonal affective disorder and found no improvements in either the B12 or the placebo group
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