Red Light


Red light is a type of visible light that has a longer wavelength and lower frequency compared to other colors in the visible spectrum. It is often associated with the color red, hence its name. Red light has a wavelength range of approximately 620 to 750 nanometers. When we perceive red light, it appears as a warm and vibrant hue. It plays a significant role in our daily lives, both naturally and artificially. In natural settings, red light is commonly observed during sunrise and sunset, as the longer wavelengths scatter less in the Earth’s atmosphere. This phenomenon creates breathtaking red and orange hues that paint the sky. Artificially, red light finds various applications in different fields. In photography, it is used as a darkroom safe light, allowing photographers to work without affecting photosensitive materials. Red light is also used in traffic signals to indicate drivers to stop. Its distinct color stands out and can be easily recognized, contributing to road safety. Moreover, red light is utilized in certain medical and therapeutic treatments. It is known for its potential to stimulate collagen production, which can benefit skin health and promote wound healing. Additionally, red light therapy has been explored for its potential to alleviate pain, reduce inflammation, and improve blood circulation. In summary, red light is a specific type of visible light with longer wavelengths and lower frequencies. It is associated with the color red and is observed naturally during sunrise and sunset. Artificially, red light is used in various applications, including traffic signals and photography. It also holds potential therapeutic benefits in the medical field.

Expert Recommendations:

Dr. Andrew Huberman recommends increasing blood flow to the scalp.¹

Is Rhodiola Rosea a Good Supplement for Red Light Therapy?

Rhodiola Rosea has been praised for its potential benefits in enhancing the effects of red light therapy. Some studies suggest that the adaptogenic properties of Rhodiola Rosea can improve energy levels and mental clarity, making it a good supplement to consider when undergoing red light therapy.


• Promotes skin health: Red light therapy stimulates collagen production, which helps improve the elasticity and firmness of the skin. It can reduce the appearance of wrinkles, fine lines, and age spots, resulting in a more youthful complexion. • Enhances wound healing: Red light therapy increases blood circulation and promotes the formation of new blood vessels, which accelerates the healing process of wounds, cuts, and burns. It can also help reduce inflammation and pain associated with these injuries. • Reduces joint pain and inflammation: By increasing blood flow and reducing inflammation, red light therapy can alleviate joint pain caused by conditions like arthritis or injury. It can also improve joint mobility and flexibility. • Boosts muscle recovery and performance: Red light therapy aids in reducing muscle fatigue and soreness by enhancing cellular energy production. It can speed up recovery after intense workouts or injuries, allowing individuals to train more frequently and at higher intensities. • Improves mood and mental health: Red light therapy has been shown to increase serotonin levels, which can help improve mood and reduce symptoms of depression and anxiety. It can also enhance cognitive function, memory, and focus. • Supports hair growth: Red light therapy stimulates hair follicles and increases blood flow to the scalp, promoting hair growth and preventing hair loss. It can also improve the thickness and quality of existing hair. • Alleviates pain and inflammation in chronic conditions: Red light therapy has been found to be effective in reducing pain and inflammation associated with chronic conditions like fibromyalgia, neuropathy, and temporomandibular joint disorder (TMJ). • Improves sleep quality: Red light therapy can regulate the production of melatonin, a hormone that controls sleep-wake cycles. By using red light therapy before bedtime, individuals can experience better sleep quality and wake up feeling more refreshed. • Enhances athletic performance: Red light therapy has been shown to improve athletic performance by increasing energy production, reducing muscle damage, and improving muscle strength and endurance. • Accelerates the healing of skin conditions: Red light therapy can be beneficial for individuals with skin conditions such as acne, eczema, psoriasis, and rosacea. It can reduce inflammation, promote healing, and improve overall skin health.


• Consult with a healthcare professional before starting red light therapy, especially if you have any pre-existing medical conditions or are taking any medications. • Avoid using red light therapy if you are pregnant or breastfeeding, as there is limited research on its safety during these periods. • Protect your eyes by wearing appropriate eye protection, as direct exposure to red light can potentially harm the eyes. • Be cautious if you have a history of photosensitivity or if you are using medications that increase sensitivity to light, as red light therapy may exacerbate these conditions. • Follow the recommended guidelines and avoid excessive exposure to red light, as prolonged or intense exposure may have adverse effects. • Be aware that red light therapy is not a substitute for medical treatment, and it is important to continue any prescribed treatments or therapies as directed by your healthcare provider. • If you experience any unusual or negative side effects during or after red light therapy, discontinue use and consult with a healthcare professional.


1. Healthy Hair Science | Huberman

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