what vitamin can be toxic
Vitamin C and B-Complex Vitamins. Vitamin C is a water-soluble vitamin which can be toxic at very high levels. Large doses taken without food may cause indigestion. Symptoms of vitamin C toxicity include nausea, diarrhea, increased gas, headache, kidney stones and excess iron uptake.
Large Doses Can be Harmful, Even Without Symptoms of Toxicity. Large doses of vitamin D can be harmful, even though there may not be immediate symptoms of toxicity. Vitamin D is very unlikely to cause severe symptoms of toxicity right away, and symptoms may take months or years to show up. This is one reason why vitamin D toxicity is so difficult to detect.