how long before vitamin b12 injection works Injections: Who Should Get Them and Do They Last? How Fast Do B12 Injections

[2] When used in supplementation, all of the vitamin B 12 vitamers have been argued to be beneficial, with there not being clear evidence that any are relatively more or less effective

For most people, the benefits last between one and two weeks

The most common side effect is irritation at the site of injection which could last up to 5-10 minutes

While both can support weight loss, they work through different mechanisms and are used for different health goals.

Vitamin B12 Supplementation in Diabetic Neuropathy MDPI article: Investigates daily methylcobalamin in type 2 diabetes neuropathy patients with B12 deficiency