High doses, often used to treat deficiencies, may lead to: Headaches, nausea, vomiting, and diarrhea Fatigue or muscle weakness Skin reactions such as rashes or itching Tingling or numbness in extremities Dizziness and, in severe cases, pulmonary edema and congestive heart failure Rare conditions like polycythemia vera, a slow-growing blood cancer In extremely rare cases, vitamin B12 can cause serious allergic reactions (anaphylaxis), characterized by facial swelling, difficulty breathing, and swallowing issues
The problem of excess B12 started in the last decade with the availability of highly efficient oral and injectable forms of B12
Endurance athletes may also deplete B12 stores faster due to increased metabolic demands and potential gastrointestinal stress from long training sessions
Can I travel with reconstituted retatrutide
Journal of Diabetes Science and Technology