Dear Dr. Walt,
Is vitamin D3 safe in mega doses? I have fibromyalgia. It helps with my brain fog. It also helps reduce my continual tiredness. What is a safe dosage?
Interested in Idaho
Fibromyalgia Syndrome (FMS) is difficult to treat and absolutely no fun to live with. In my mind, FMS is an example of what Paul describes as a “thorn in the flesh” (2Co 12:7).
At least one study has shown that people suffering from the chronic pain of FMS may benefit from taking a vitamin D supplement if they suffer from low levels of the vitamin.
But, for anyone wanting to take vitamin D, I would recommend taking it with the guidance of your family physician and based upon blood testing of your 25-hydroxyvitamin D level.
The optimal level recommended by some experts is 40-60 ng/mL.
For treating vitamin D deficiency, some experts recommend 6,000 IU/day of vitamin D3, taken with the largest meal of the day, for 8 to 12 weeks. Then your blood level should be rechecked.
Once your blood levels are normal, and if you are under age 60, a daily maintenance of 1,500 – 2,000 IU/day of vitamin D3 should do the trick.
However, for older adults, the American Geriatrics Society (AGS) recommends 4000 IU/day.
In fact, the AGS recommends this dose for ALL men and women 60 or older. And, the Institute of Medicine has determined that a 4000 IU daily supplement is safe and can be given without risk of toxicity.
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