Which Is Better? Sublingual B 12 vs. Vitamin B 12 Pills. ConsumerLab.com B12 Injections vs. Oral Supplements: Which Is Better? When would sublingual B12 supplements (as opposed to B12 tablets or injections) be indicated in a client with B12 deficiency? , The choice to use a sublingual B12 versus a tablet or injection is Effect of two different sublingual dosages of vitamin B12 on cobalamin nutritional status in vegans and vegetarians with a marginal deficiency: A randomized controlled trial ScienceDirect B12 Injections vs Pills Baltimore: Which Works?