Vitamin D is important for bone and immune health, but taking too much over time can cause problems by raising calcium levels too high. Headlines like “stop taking vitamin D immediately” are often dramatic, but there are symptoms that deserve attention.
Possible signs of too much vitamin D
1. Nausea or vomiting
Too much vitamin D can lead to high calcium levels, which may upset the stomach.
2. Extreme thirst or frequent urination
High calcium can make you feel unusually thirsty and cause more trips to the bathroom.
3. Weakness, confusion, or unusual tiredness
Very high vitamin D levels can affect muscles and the nervous system.
4. Kidney pain or kidney stones
Excess calcium may contribute to kidney stones or kidney stress.
Important context
Vitamin D toxicity is uncommon and usually happens from:
- taking very large supplement doses,
- combining multiple supplements,
- or using high doses for a long time without monitoring.
Sunlight and normal foods rarely cause toxicity by themselves.
What to do
- Check how much vitamin D you’re taking.
- Don’t exceed prescribed doses.
- Contact a doctor if symptoms are severe or persistent.
- A blood test can measure vitamin D and calcium levels.
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