If you’ve done any research on the topic of vitamin b12 injections you know the effectiveness of vitamin B12 injectables compared to sublinguals is a matter of varying opinion. The effectiveness of the delivery method can only be taken on a case by case basis as everyone’s metabolism is unique. It is widely circulated that the only benefit of the injectable is that it hits the blood stream faster and is more easily absorbed, which is essentially true. The only issue left to debate is the relevance of this immediate and direct method of delivery.