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Vitamin B 12 and nucleic acid metabolism The figure shows pathways of folate and vitamin B 12 metabolism of nucleic acid synthesis and methylation reactions
On the other hand, excess vitamin B12 is expelled through urine, so there is little need to feel uneasy about injecting too much B12
This indicates that vitamin B at therapeutic doses is very safe in pregnancy
The catch and this is where honesty matters on a YMYL page is that can survive the gut in principle is not the same as has a proven, quantified oral bioavailability in humans. No such human number exists for this molecule
Some people use sublingual delivery (powder held under the tongue briefly before swallowing) but there's no strong evidence this meaningfully improves bioavailability for this compound class
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