For broader stacking-safety context see the PepPal side-effects guide
MedlinePlus: B Vitamins NCBI: Statpearls: Vitamin B12 Deficiency (Cobalamin) Cochrane Database of Systematic Reviews: Progesterone or ProgestogenReleasing Intrauterine Systems for Heavy Menstrual Bleeding ScienceDirect: Medicine: Iron, Vitamin B12 and Folate Pernicious Anaemia Society: Symptoms of Pernicious Anaemia Journal of Human Nutrition and Dietetics: Avoidance of Meat and Poultry Decreases Intakes of Omega-3 Fatty Acids, Vitamin B12, Selenium and Zinc in Young Women EBSCO Publishing: Dysmenorrhea Medical News Today: Everything You Need to Know About Vitamin B-12 National Institutes of Health Office of Dietary Supplements: Vitamin B12 Penn State Hershey: Milton S
Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12. Chloramphenicol and other drugs having bone marrow suppressant properties may cause a lack of therapeutic response to vitamin B12
In published metabolic and body-composition research, AOD-9604 is frequently grouped with other peptides investigated for energy-expenditure, GH-axis and adipose research
However, the potential benefits of intravenous vitamin C in cancer treatment remains controversial