Vitamin D: A Rapid Review

Mark A. Moyad, MD, MPH


Dermatology Nursing. 2009;21(1) 

In This Article

Calcium and Vitamin D Recommended Daily Allowances

Calcium and vitamin D work synergistically to provide optimal potential clinical benefits, and this is now well known from clinical research (Khazai et al., 2008). Regardless of the adult age, the average intake of calcium is about 600 mg to 800 mg per day at best. These recommended dosages from various government organizations and from the author’s personal experience are found in Table 3 (Prentice, 2002).

By 10 years of age (double figures) nutritional intake should include approximately 1,000 mg of calcium a day total (from diet and supplements) and close to 1,000 IU of vitamin D (from diet and supplements after blood testing) for the rest of one’s life, regardless of gender.

The daily requirement of vitamin D in Table 3 is disputed by this author. The minimum requirement should be from 400 to 800 IU in all ages, and especially, from age of a few years old to over 70 years, it should be at least 800 IU. However, as stated previously, the exact determination of minimum vitamin D intake should come from a blood test given in the fall or winter. Also, patients should be told that vitamin D is a fat-soluble vitamin that takes months to deplete; it also does not have to be in a calcium supplement as some companies advertise. It is difficult today, however, to find a calcium supplement without vitamin D in it.


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