Here is what Dr. Axe Has to Say about Red Light Therapy: In an Article from Dr. Axe is Medicine 

What Is Red Light Therapy? Red light therapy involves having low-power red light wavelengths emitted directly through the skin, although this process cannot be felt and isn’t painful because it doesn’t produce any heat. Red light can be absorbed into the skin to a depth of about eight to 10 millimeters, at which point it has positive effects on cellular energy and multiple nervous system and metabolic processes.
Red light therapy has shown promise for treating symptoms of joint pain or osteoarthritis due to aging, those caused by cancer treatments like chemotherapy or radiation, hair loss, wounds or incisions, acne, wrinkles and skin discoloration, chronic muscular pain, neurological damage, and tissue damage (often at the root of tears, sprains or pulls). As you’ll learn, even seeing the color red is physically stimulating, primes our senses and gets our blood pumping, so imagine what red light penetrating right into your body can do.
Although there is still controversy over this treatment and more research needed, according to the company Light Therapy Options LLC, there are virtually “no known adverse side effects” of red light therapy treatments, rather a growing list of many anti-aging benefits. (2)
Some of the ways that red light wavelengths work are: (3)

• Increasing energy levels by promoting release of ATP from cells’ mitochondria (4)
• Stimulating DNA/RNA synthesis (5)
• Activating the lymphatic system, an important part of our immune system that helps carry waste out of the body
• Increasing blood flow/circulation, thereby helping bring more oxygen and nutrients to our cells and tissues
• Forming new capillaries (small blood vessels)
• Improving natural production of collagen and fibroblasts, important for things like skin, joint and digestive health
• Repairing and restoring damaged soft connective tissue
• Stimulating or decreasing inflammation, which helps control our natural healing capabilities
• Lowering effects of oxidative stress/free radical damage, which is associated with many effects of aging