B12 Injections vs Pills: Richmond's Complete Guide New Prescription Vitamin B12 Tabs May Eliminate Need for Injection MPR Did you know that only 30% of the vitamins & supplements swallowed in pill form are absorbed by the body. Vitamin injections are superior for severe, immediate deficiencies as they bypass Vitamin B12: Injection vs Tablets, Vitamin B12 Tablets ?, Mild deficiency, Digestion , Long term maintenance, Vegetarians (regular use), Pros:, Easy to take, Affordable,