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None of the types of vitamin B, including thiamine (Vitamin B1), pyridoxine (Vitamin B6), niacin (Vitamin B3), and folic acid (Vitamin B9), can be stored by the body
The one real argument for injecting is bypassing first-pass metabolism, and the strength of that argument depends entirely on which bioavailability study you believe (3.5% in mice versus 38.4% in rats)
Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement
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