Is there actually any human evidence that this works
Foods like meat, eggs, dairy products, and fish are excellent sources of vitamin B12
Depending on the blend you choose, you may notice improved mental focus, better sleep, or faster recovery from stress or illness
As the However, while risks of severe toxicity are low, some side effects are still possible, such as: temporary symptoms, such as itching, swelling, or diarrhea allergic reaction damage from the injection hypokalemia, or low potassium levels infection negative interactions with certain medications, such as: metformin (Fortamet, Glucophage, Riomet) medications to reduce gastric acid, such as proton pump inhibitors or H2 receptor antagonists Always talk with a doctor before using vitamin B12 supplements