b12 injection skin rash from Understanding the B12 Vitamin Shot: Benefits, Risks, and Dosage Guide Hives from b12 liquid? :
Description
This essential vitamin is administered via injection, bypassing the digestive system to quickly enter your bloodstream for maximum absorption and nearly instant results

Low B12 levels can lead to fatigue, weakness, tingling in the hands and feet, and mood changes such as irritability or low concentration
Ophthalmic Epidemiology

But, dont get discouraged just yet
That causes minor bruising that resolves within a few days

The pathway also intersects with inflammatory signaling
