Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the 180pg at 21 years old. Whats everyone's experience after injections? : r B12_Deficiency Normal B12 Levels (by Age) vs. the Optimal Range PA Relief Vitamin B12 Injection Dosage for Adults: 7 Key Facts & Guidelines Liv Hospital