Injections offer superior bioavailability compared to oral supplements, as they bypass the digestive system and deliver B12 directly into the bloodstream to fuel your body
If you are weighing B12 injections against oral supplements, the right choice depends less on which method is "stronger" and more on your body, your diet, and whether you actually have a deficiency
B12 absorption depends on a protein produced in your stomach called intrinsic factor
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Frequently Asked Questions How quickly do vitamin B-12 injections work
If it was hydroxocobalamin then you're extremely unlikely to get an allergic reaction to it on subsequent jabs