LED phototherapy has been subject to moderate amounts of research with studies demonstrating absolute increases in the amount of collagen and elastin deposition after multiple treatments with different wavelengths of light. Increases in collagen and elastin have been proven using cellular analysis under the microscope in clients treated for sun damage. Multiple studies have also been published regarding the effects of treatment with LED for acne demonstrating moderate improvements especially when BLUE and RED light is combined. Phototherapy has been used in the treatment of psoriasis for many years. Treatment with LED has been compared to treatment with laser devices and have been shown to have much fewer side effects and safe for use in all skin types.