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Information on the latest vitamin D news and research.

Find out more information on deficiency, supplementation, sun exposure, and how vitamin D relates to your health.

My doctor gave me 300,000 iu of vitamin D (he said I was low but didn't say how low) to be taken over a week. How long before I feel the effects? He said I should take this then nothing else (apart from salmon once a week) and he will retest in six months’ time.

Ask the Vitamin D Council

Asked by  jackieg on November 2, 2014

  • Jeff Nicklas
     Jeff Nicklas on


    So, you are taking 300,000 IU per week for six months? A usual prescription regimen to quickly treat vitamin D deficiency is 50,000 IU/week for about 8 weeks before being put on a maintenance dose.

    Generally, your levels will begin to change after about a month of supplementing. If you check your levels at this time, you will have a good indicator of how that particular dose is affecting your levels.

    Since you were prescribed a higher than normal dose, it is recommended to continue to work closely with your doctor to ensure that the dose is safe and effective in raising your levels.

    Answered by  Jeff Nicklas on