Journal of Psychoactive Drugs, 34(3), 273283
Potential concerns include: Unknown product quality Contamination or sterility issues Incorrect dosing Injection site reactions Allergic or immune reactions Medication interactions Hormonal or metabolic effects Unclear long-term safety Lack of monitoring Delayed treatment for an actual injury or medical condition Medical oversight is especially important for patients with autoimmune conditions, cancer history, active infections, chronic inflammatory disorders, cardiovascular concerns, hormone-sensitive conditions, or complex medication regimens
Sources NIH Office of Dietary Supplements, Vitamin B12 Fact Sheet NIH Office of Dietary Supplements, Choline Fact Sheet MedlinePlus, Cyanocobalamin Injection Mayo Clinic, Vitamin B12 Injections and Weight Loss NCBI Bookshelf, Essential Amino Acids PubMed, Inositol Phosphate Signaling Network The American Journal of Clinical Nutrition, Lipotropic Agents and Lipid Transport
In fact, some patients do that