No completed human efficacy or safety trial
The 2023 GRAS designation permits marketing as a dietary supplement ingredient but NOT as a therapeutic agent
Common research protocols cited in the peptide community use 1 to 2 mg, 3 to 5 times weekly, over 8 to 12-week cycles
This means that after 24 hours, up to nearly half of the injected vitamin B12 had been absorbed
Not dramatically, not all at once, but slowly
Other ways to raise your B12 If injections are not right for you, there are other options: oral B12 tablets or sublingual drops, more B12-rich foods like fish, eggs, and fortified cereals, or a full weight loss program that combines nutrition, activity, and medical oversight