Those with sluggish detoxification pathways
[1] Without intrinsic factor, dietary B12 cannot be absorbed effectively, leading to deficiency regardless of dietary intake
People with Lebers disease or allergies to cobalt or the injections components should not get B12 injections
Small observational studies have reported modest weight loss, but these typically lack adequate controls for dietary modification, exercise, and placebo effects
If you follow a plant-based diet, you'll likely need fortified foods or supplements to maintain healthy levels
Potential side effects include: Because its still being studied, its not FDA-approved for weight lossbut its being widely used in clinical peptide therapy protocols under supervised care