does a b12 injection work straight away How Fast Vitamin Shot Work? Vitamin B12 Injections - Vie

The Black Box warnings, full side effect list, and drug interaction details remain in the Safety Details section below

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Atrophic gastritis, a condition that depletes stomach acid, also reduces B12 absorption

Nitrous oxide, a commonly used anesthetic, oxidizes and inactivates vitamin B 12 , thus inhibiting both of the vitamin B 12 -dependent enzymes, and can produce many of the clinical features of vitamin B 12 deficiency, such as megaloblastic anemia and neuropathy

Myth: Its Easy to Get Too Much B12 Its natural to worry about overdoing it with any supplement, but you can rest easy when it comes to B12