Too much is not safe. If having vitamin D too much more than needed, vitamin D can cause toxicity. These toxicities may show non-specific symptoms such as anorexia, weight loss, polyuria, and heart arrhythmias. More seriously, it can also raise blood levels of calcium which leads to vascular and tissue calcification, with subsequent damage to the heart, blood vessels, and kidneys. The use of supplements of both calcium (1,000 mg/day) and vitamin D (400 IU) by postmenopausal women was associated with a 17% increase in the risk of kidney stones over 7 years in the Women’s Health Initiative clinical study. Long-term intakes above the upper limit level increase the risk of adverse health effects.
Toxicity is much more likely to occur from high intakes of dietary supplements containing vitamin D. Read the label – not take calcium over 1,000 mg per day and vitamin D at 400 IU per day.
Excessive sun exposure does not result in vitamin D toxicity because the sustained heat on the skin is thought to photo-degrade pre-vitamin D3 when it is formed. In addition, thermal activation of pre-vitamin D3 in the skin gives rise to various non-vitamin D forms that limit formation of vitamin D3 itself. Some vitamin D3 is also converted to non-active forms. Watch Froning The Fittest Man In History (2015) Full Movie Online Streaming Online and Download
Intakes of vitamin D from food that are high enough to cause toxicity are very unlikely.