Do Vitamin D Supplements Help Psoriasis? We Asked a Dietitian

By Elena Donovan Mauer
Reviewed by Allison Truong, M.D.
April 11, 2022

Vitamin D is something we often hear people with psoriasis ask about. Sure, there are topical prescription vitamin D creams (such as calcipotriene or calcitriol) that can help soothe inflammation, but what about taking supplements orally or adding more vitamin D to your diet? We asked our nutrition expert, Elizabeth DeRobertis, a New-York based registered dietitian about vitamin D and whether it is worth the hype for improving psoriasis symptoms.

Why do we keep hearing about vitamin D for psoriasis and psoriatic arthritis?

Vitamin D has been a buzz vitamin for a few years now. Vitamin D is a nutrient that we eat, and also a hormone that our bodies produce. It is required for the body to absorb and retain calcium, so it’s long been known to be essential for bone health. A few years ago, there were some studies that found it may help to reduce cancer-cell growth; and then, more recently, some studies on COVID-19 found that taking vitamin D may be beneficial to boost immunity to the virus.

We know that we make vitamin D through exposure to the sun, and that the process happens through our skin. There are some studies that link vitamin D deficiencies to psoriasis. For example, one found a correlation between vitamin D deficiency and psoriasis, but it doesn’t look like the deficiency actually causes the psoriasis. (If low vitamin D levels always caused psoriasis, then many more people in the population would have psoriasis, but they do not.)

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