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Interactions With Medications. Even though vitamin B-12 is safe if you take too much, it can interact negatively with certain medications. Chloramphenicol, a type of antibiotic, affects how your body responds to B-12.Even though you're taking a large dose of B-12, the medication limits the vitamin's function.ost vitamins and minerals can be toxic if you take too much. However, vitamin B-12 is a little different. Your system only absorbs a small amount at a time and gets rid of what it doesn't need, which means it's generally safe, even if you take too much.
Although most people take vitamin D supplements without any problems, itâs possible to take too much. This is called vitamin D toxicity. Vitamin D toxicity, where vitamin D can be harmful, usually happens if you take 40,000 IU per day for a couple of months or longer, or take a very large one-time dose. Vitamin D is fat-soluble, which means your body has a hard time getting rid of it if you take too much. When you take large amounts of vitamin D, your liver produces too much of a chemical called 25(OH)D. When your 25(OH)D levels are too high, this can cause high levels of calcium to develop in your blood.