are b12 injections synthetic Sandoz Vitamin Injectable Solution - 1000 mcg/10 mL Not All B12 Injections Are
Description
It far outperforms the pill form

When not to use it is just as important

In a 2018 review, researchers found evidence that taking 1,000 mcg of B12 and getting B12 injections had similar effects on treating B12 deficiencies

Patients who are pregnant, nursing, or have certain conditions (such as pancreatitis, gallbladder disease, or thyroid cancer) may not be eligible

Add 3.0 mL bacteriostatic water to one 2 mg vial ~0.667 mg/mL (667 mcg/mL), a large, easy-to-measure dilution
