vitamin b12 pills vs injections Do You Need a Prescription for Injections? B12 Injections vs. Oral Supplements:

Additionally, you should take your own preferences and needs into account as well as the suggestions offered by your healthcare provider

Thus, dietary supplement B 12 supplementation at 500 to 1000 g per day allows pernicious anemia and certain other defects in B 12 absorption to be treated with daily oral megadoses of B 12 without any correction of the underlying absorption defects

Patients with existing diabetes or kidney disease can have more adverse effects like further reducing the kidney function

Because the needle stays in the fatty layer, there is less chance of catching a nerve or a blood vessel than with a deeper injection, which is one reason some clinicians prefer it for maintenance dosing