Hi KULWANT kaur,
The following are recommendations in the United States: Estimated Average Requirement is 400 IU per day and the Recommended Dietary Allowance is 600 IU per day for women aged 51-70. However, depending on your medical history and current conditions, your physician may recommend a different dose. Vitamin D3 is a form of vitamin D. It is produced by humans in the skin when skin is exposed to sunlight. Dietary sources of vitamin D may include fish, fortified milk, eggs and cod liver oil.
Take care,
Shauna Hill, RD, LD
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