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Vitamin D vs broad spectrum phototherapy in the treatment of seasonal affective disorder. Gloth FM 3rd, Alam W, Hollis B. J Nutr Health Aging. 1999;3(1):5-7. PMID: 10888476 All subjects receiving vitamin D improved in all outcome measures. The phototherapy group showed no significant change in depression scale measures. Vitamin D status improved in both groups (74% vitamin D group, p < 0.005 and 36% phototherapy group, p < 0.01). Improvement in 25-OH D was significantly associated with improvement in depression scale scores (r2=0.26; p=0.05). Vitamin D may be an important treatment for SAD. Further studies will be necessary to confirm these findings..

Psoriasis is a chronic skin condition that accelerates the rate at which your skin cells grow. An effective method to treat psoriasis is phototherapy or light therapy.

Psoriasis is an auto-immune illness that affects almost three percent of the world's population. People who suffer from psoriasis experience a great deal of skin irritation and discomfort.