Side effects and cautions B12 has no established upper limit due to low toxicity, but injections can have side effects: Common: soreness, redness or swelling at the injection site
For individuals, following a plant-based diet, fortified plant-based milk, and nutritional yeast can help bridge the gap
Furthermore, phase II studies were undertaken to prove the efficacy of mecasermin rinfabate (IGF-1/IGFBP-3) in paediatric severe burns and had promising outcomes when doses of 14 mg/kg/day [269273] were used
It targets two hormones, not just one, which can help lower blood sugar and may lead to even greater weight loss
Deficiency can also be caused by poor absorption
If your goal is addressing a B12 deficiency, a B12 shot may be appropriate on its own