extremely tired right after b12 injection Vitamin A Vitamin B12 is a quick shot that gives your body vitamin B12 directly into the muscle. This helps your body absorb it faster than tablets. Vitamin B12 helps Feeling Tired All the Time?
Description
Uses of Key Injection Vitamin B12 deficiency Benefits of Key Injection Vitamin B12 deficiency Key B12 Injection is a supplement of vitamin B12

Seek medical help if you develop severe allergy symptoms, breathing difficulty, or persistent skin reactions
is it common

Because body sizes and individual deficiencies can vary, there is not a standard dosage per syringe