vitamin b12 methylcobalamin injection side effects Should You Take Natural vs. Synthetic B12? Are Vitamin B12 Shots Right

Vitamin B12 injection effects can include: Soreness or slight bruising where the needle goes in A warm feeling right after the injection Mild headache in some people, which usually passes quickly Rare allergic reactions, which is why a health check happens first Vitamin B12 injection painful is a common worry, but most people describe it as a quick pinch rather than anything severe

Vitamin B12 and semen quality. Biomolecules 7.2 (2017): 42

But it can be helpful to learn about potential risks to decide if getting a vitamin B12 injection is right for you

In lyophilized (powder) form, store in freezer for up to 2 years