Dehydration is worth mentioning separately
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
It is worth noting that unlicensed medicines can be lawfully supplied in limited circumstances for example, as 'specials' manufactured to meet the specific clinical needs of an individual patient under a prescriber's direction
We need more evidence to know if the pills are as effective as the shots over time, though some research suggests they work, especially when it comes to sublingual supps