Vitamin A: Too much vitamin A can cause joint pain, irritated skin, nausea, or more extreme liver damage and birth defects. Certain forms of vitamin A pose a higher risk of toxicity, such as retinol, retinyl acetate, and retinyl palmitate. Beta-carotene and carotenoids are less risky.Vitamin D: Taking too much vitamin D can raise the calcium levels in the body too high, causing pain, dehydration, nausea, vomiting, kidney stones, or even kidney failure and heart disease. The Tolerable Upper Intake Level (UL) for vitamin D is set at 4,000 IUs, though the Food and Nutrition Board committee noted adverse symptoms are unlikely at intakes below 10,000 IUs. Getting blood levels tested to see the actual vitamin D status is the most reliable way to determine risk for toxicity.Vitamin E: Vitamin E toxicity appears to be less likely, though still possible, especially from long-term excessive intake. The Tolerable Upper Intake Level (UL) is set at 1,000mg for adults. Risks include hemorrhage and stroke.Vitamin K: Too much vitamin K has not been shown to be associated with toxicity risk., There are gummy vitamins for all ages and life stages. We spoke to dietitians to find the best gummy vitamins to meet your needs., Discover the best gummy vitamins recommended by dietitians and what to look for when choosing a high-quality supplement you’ll actually enjoy..