In general, many health authorities recommend around 10 micrograms (400 IU) daily for most adults, although needs may vary depending on age, lifestyle, and medical advice.
Still, taking too much vitamin D over time may lead to side effects, especially when taken in high doses for long periods.
High doses of vitamin D can cause a buildup of calcium in the body, which may result in these four symptoms:
- nausea
- vomiting
- stomach pain or cramps
- feeling unusually weak or tired
Additionally, too much vitamin D may increase the risk of kidney problems, including kidney stones in some people.
Signs of more serious problems can include:
- pain in the side of the abdomen
- feeling very thirsty
- needing to urinate more often
- confusion or unusual tiredness
- blood in the urine
If symptoms appear after taking high-dose vitamin D supplements, reducing or stopping the supplement and seeking medical advice may help. Most people can get enough vitamin D through a balanced diet, safe sunlight exposure, or the correct supplement dose recommended by a healthcare professional.
