B12 Side Effects and Interactions - Greatist
Like all good things, too much of any vitamin or mineral can stir up trouble. Vitamin B12 is no exception and can cause side effects. Vitamin B12 is essential for DNA production, red blood cell formation, DNA synthesis, and brain health. But if you take B12 supplements, you risk ingesting more B12 than you actually need. Here are the deets. B12 supplements come in a variety of forms, including capsules, tablets, soft gels, gummies, and drops or sprays. Taking these B12 supplements when you aren't deficient may cause side effects like: If you notice any of these side effects, stop taking B12. And call your doc if anything gets worse. While not fully proven side effects, research has also linked the following health risks to taking high dose B12 supplements when you aren't deficient, like: Skin conditions. A 2015 research review linked taking too much B12 to acne, rosacea, vitiligo, and atopic dermatitis. Colon cancer risk. A 2019 study found that older adults supplementing hi...