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how to inject a vitamin b12 shot Store B12 in your arm Best Vitamin B12 Injection Sites:
Description
One trial used 2000 g/day vitamin B 12 and demonstrated a mean difference of 680 pg/mL (95% confidence interval 392.7 to 967.3) in favor of oral vitamin B 12

deficiency can cause harm to fetus (neurodevelopment issues)

What else

No fasting required

This creates two downstream problems: (1) SAM depletion reduces the availability of methyl groups for other critical methylation reactions, including DNA and histone methylation