can b12 injections make you sick Shots at Home: How, Where & How Often to Inject Yourself Benefits of Vitamin B12 Shots

Always inspect each vial visually before use

Youre on a medication that limits B12 absorption A wide range of common meds can mess with your bodys ability to absorb vitamin B12 including Antibiotics such as neomycin Diabetes medications such as metformin Gastric acid inhibitors such as the proton pump inhibitors omeprazole (Prilosec) and lansoprazole (Prevacid) Antihistamines and antacids such as cimetidine (Tagamet) and ranitidine (Zantac) 5

As the body only absorbs the B12 it needs, there is no risk of overdose

QJM: An International Journal of Medicine

If you want to compare the two methods, start with their dosage amounts

And wonder if the rate of absorption would be sufficient for those with neurological symptoms, at least initially