In one study, researchers used alternating blue and red light to reduce acne up to 78%. In another, they alternated between blue and red each week to achieve a 69% acne lesion decrease. In the third study, they found that differing red wavelengths both worked well to reduce acne up to 48%. In the fourth, they used a low power laser green light to reduce acne 67%.
Yes, you can reverse photoaging. Red, infrared, yellow, and violet light therapy can reduce wrinkles, increase collagen, and smooth out pigmentation issues. Studies show that treatment with these lights reverse photodamage from the sun. While dermatologists offer topical treatments, his article is all about how to reverse photodamage using light therapy.