Q:

Is it safe to take 1000 milligrams of vitamin D3?

A:

Quick Answer

It can be unsafe to take 1,000 milligrams of vitamin D3 daily. Taking vitamin D daily for prolonged lengths of time in amounts that exceed 4,000 IUs (100 micrograms) may cause high calcium blood levels, notes WebMD. The tolerable upper intake level for vitamin D is 4,000 IUs for people aged 9 years and older, as noted by the National Institutes of Health's Office of Dietary Supplements.

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Full Answer

The tolerable upper intake level refers to the amount that must not be exceeded in one day. However, doctors may prescribe a short-term treatment of increased doses of vitamin D for certain medical conditions. In regards specifically to vitamin D3, 100 micrograms of vitamin D3 when taken orally for a 3 month period daily may be safe and causes no side effects, as noted by Mayo Clinic.

Vitamin D3 and D2 are two forms of vitamin D. Vitamin D is needed by the body for the absorption of calcium. However, an excess of vitamin D can cause side effects, such as feeling weak or tired, headaches and dry mouth, notes WebMD.

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