Vitamin D toxicity can occur from taking too much vitamin D, most often in the form of supplements, as the low levels in food are unlikely to reach a toxic level.
Symptoms of vitamin D toxicity include:
– Anorexia
– Weight loss
– Irregular heartbeat
– Hardening of blood vessels, potentially damaging the heart and kidneys
The NHS advises that taking more than 100 micrograms (4,000 IU) of vitamin D per day could be harmful.
Excessive exposure to sunlight will not cause an excess of vitamin D production. Always be aware to protect your skin in the sun for long periods.