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What are toxicity symptoms for vitamin D?

Excessive intake of vitamin D can be toxic, and toxicity of vitamin D can come from either its plant-based (D2) or animal-based (D3) form. Symptoms of toxicity include loss of appetite, nausea, vomiting, high blood pressure, kidney malfunction, and failure to thrive. However, it is also important to note that vitamin D deficiency poses a far greater risk to the vast majority of individuals than vitamin D toxicity and that vitamin D toxicity from food intake is extremely unlikely. Less than one-third of all persons in the U.S. meet the Dietary Reference Intake level for vitamin D, and are far from consuming anything close to potentially toxic levels.

In 2010, the National Academy of Sciences set Tolerable Upper Intake Levels (ULs) for vitamin D as follows:

• infants, 0-6 months: 25 micrograms (1,000 IU) per day
• infants, 6-12 months: 38 micrograms (1,500 IU) per day
• children, 1-3 years: 63 micrograms (2,500 IU) per day
• children, 4-8 year: 75 micrograms (3,000 IU)per day
• children and adolescents, 9-18 years: 100 micrograms (4,000 IU) per day
• adults, 19 years and older: 100 micrograms (4,000 IU) per day
• pregnant and lactating women, 100 micrograms (4,000 IU) per day.