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B12 injection shots can usually be felt within 24 hours (and a change should show in blood tests after a month or two) A high dose of B12 oral supplementation takes the same time as an injection: roughly 24 hours to feel an improvement and then up to 2 months to show in blood markers
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Vitamin B9 (folate/folic acid) - Vitamin B9 is involved in the metabolism of homocysteine, an amino acid that has been linked to an increased risk of cardiovascular disease
Getting a vitamin B12 shot is no different from any other injection
B12 injections are shots that contain high doses of vitamin B12 that are used to quickly elevate levels in someone with a deficiency
