B12 Injections vs. Oral Supplements: Which Is Better? Vitamin B12 Deficiency? Heres the best way to treat it!, Many people take oral or sublingual tablets, but they may not always be effective especially if absorption is poor., The active injectable Oral versus intramuscular administration of vitamin B12 for vitamin B12 deficiency in primary care: a pragmatic, randomised, non inferiority clinical trial (OB12) BMJ Open Why Vitamin Injections Can Be More Bioavailable Than Oral Supplements When it comes to getting the most out of your vitamins, how you take them matters. Here's why vitamin injections are