If exposing yourself to sunlight isn't providing you with sufficient vitamin D to relieve your psoriasis, you can get this important vitamin from a prescription like Calcipotriene (Dovonex). This synthetic form of vitamin D will help to slow the growth of skin cells and is available in cream, ointment and solution form.
In addition to slowing the growth of new skin cells, calcipotriene will also reduce lesions and aid in the removal of scales. This form of treatment oftentimes can be used in conjunction with other topical medications or light therapy. On the down side, calcipotriene can sometimes lead to skin irritation, so consult with your physician if your skin condition worsens as you use this medication.