after b12 injection side effects : r/B12_Deficiency Feeling worse after B12 Injection:

Metabolic Pathways

Check with your health care professional or read the information provided with your medication for additional side effect information.

In the event of an overdose, it is important to seek immediate medical assistance by consulting your doctor or visiting the nearest hospital

Some people use sublingual delivery (powder held under the tongue briefly before swallowing) but there's no strong evidence this meaningfully improves bioavailability for this compound class

Caution is advised when supplementing vitamin B12, especially in injectable form for individuals with allergic tendencies

Should it be injected at a clinic or at home