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Typically, vitamin B12 injections can be effective for about one week
[13] If you experience any suspected side effects from a B12 supplement or medicine, you can report this via the MHRA Yellow Card Scheme (yellowcard.mhra.gov.uk)
[18] Additionally, very high doses of folic acid could potentially mask a B deficiency, so its important your doctor knows about any folate supplements you take
"Vitamin B12"
Vitamin B12 deficiency can lead to many conditions
The critical concept here is bioavailability which is just a fancy word for how much of a nutrient your body can actually absorb and put to work
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