Red Light Therapy for Testosterone: Effects & Benefits

Red Light Therapy Effects On Testosterone

Red light therapy is used for several purposes today including skin issues, brain disorders, eyesight problems, muscle pains, depression, and even treating the side effects of cancer therapies [1]. Interestingly,  experiments on animals and humans are also confirming the effectiveness of red light therapy for testosterone. This also brings in many associated questions to our mind such as:

  • How does red light therapy for testosterone actually work?
  • What are some clinical studies that support it?
  • Is it effective or has some side effects?

This article will help you explore all about testosterone and how red light therapy works to increase the level of testosterone within a week. Keep reading. 

What Is Testosterone?

Testosterone is the male “sex hormone” that is produced by the testicles and due to the presence of this hormone, men develop heavy voice, hairy body, bone mass, and overall muscular stature. Testosterone is the major androgen promoting sperm production and sex drive in males. After puberty, The testicle cells called interstitial cells or Leydig cells produce testosterone persistently, and after a man reaches his 40’s, the production of this hormone starts declining [2].

With the diminishing production of testosterone, several health issues, such as high blood pressure, low sex drive, heart diseases, depression, weakness, and fatigue may occur [3]. 

red light therapy for testosterone

A male may experience low levels of testosterone due to age factors or certain other health conditions. It is, therefore, pertinent to find out the factors that affect testosterone levels over 

Factors Affecting Testosterone Levels

Several factors may affect testosterone levels in man. Some of them are as follows [4].


Age is the key factor that reduces testosterone levels in males. As I mentioned earlier, the production of testosterone is at its peak during adolescence and puberty however after men reach their ’40s, this hormone typically tends to get slower. However, following certain diets or therapies such as red light therapy for testosterone, you may counter the effect of aging on your testosterone levels.

Certain Health Conditions and Chronic Obesity

Certain health conditions such as diabetes, chronic liver, or kidney diseases can decrease the level of this hormone in men. Obesity in males is also connected with a decline in free testosterone levels due to the suppression of a part of the neuroendocrine system responsible for metabolism called The hypothalamic-pituitary-thyroid axis or HPT axis.


Hypogonadism occurs when sex glands produce little or no sex hormones. There may be a problem with the testicles due to an injury, a genetic condition, or the pituitary gland in the brain. The pituitary gland releases a hormone that stimulates the production of testosterone and if this does not function properly, a male may face hypogonadism [5].


Restricting yourself from eating meat and a protein diet for a long time and following a strict vegetarian diet may cause low testosterone levels. There is no cholesterol in vegetables and cholesterol is an essential part of testosterone production [5].


Increased levels of stress, depression, financial and family issues, workplace conflicts can ruin a men’s active life span by affecting their testosterone level. Of course, low sex hormones means less interest in joy, fun, and love life. 

Repeated Infections 

Certain Infections, mumps, sexually transmitted diseases, and hepatitis may reduce the level of testosterone in males. However this is not a permanent decline and certain energy boosting activities such as walking, exercise or therapies may restore the testosterone production.

Clinical Studies About Red Light Therapy’s Effect on Testosterone 

Several studies are emphasizing the considerable impact of red light therapy on testosterone. 

There has been clear evidence where lack of interest in sex is successfully treated by exposure to bright light. In Italy, a group of scientists led by Professor Andrea Fagiolinifrom the University of Siena in Italy has tested sexual and physiological responses to bright light. 

The group figured out that if a lightbox is used regularly during the early morning, it leads to an increased level of testosterone and an enhanced level of satisfaction in terms of sex.  The sample consisted of 38 men who were being treated at the urology department of Siena University. These men were diagnosed with sexual arousal and hypoactive desire disorder. In both these cases, one can lose interest in sex.

The initial examination determined the baseline of their interest and their testosterone level was measured. Then, the sample group of men was divided into two groups.  The researcher figured out that there is a significant three-fold improvement in terms of sexual satisfaction between the light therapy group over the control group and a significant increase in the level of testosterone who received light therapy [6].

Measuring red light and nIR power output

Infertility in men is a common worldwide issue today and is estimated to have affected around 7.5% of males in European regions only. Couples are therefore relying on medicine to achieve pregnancy. One of the potential less risky treatments in this regard is photobiomodulation therapy or red light therapy for testosterone. This therapy bio stimulates cells and tissues in the testicles. Not only does it lead to an activation of the mitochondrial respiratory chain and sperm movement but it also proved to be particularly useful in avoiding chemical induction in the Spermatozoa culture medium [7].

Another study from the University of California in 2015 suggests that red light improves spermatozoa motility and does not induce oxidative DNA damage. There is another evidence which shows that by increasing sperm swimming speed, one can increase the swimming force and by using a  633nm red light irradiation, there was an increase in mean squared displacement in trapped sperm [8].

Due to heavy exercises and training, the testosterone level amongst the athletes may be dropped while they are planning a pregnancy.  At the recommendation of the doctor, red light therapy for testosterone was used and it worked. This correlates with the findings of a study where the researchers figured out the effects of low‐level laser light exposure on the motility of spermatozoa.

Around thirty‐three semen samples were gathered for the purpose of analysis and most of them had defective sperm quality. After 30 minutes of exposure to the light therapy, the treated sample was compared with the untreated sample and a significant change with respect to the sperm motility was noted within 30 minutes [9]. This shows that the therapy is pretty much effective for immediate results.

Suggested Post: Does Red Light Therapy Work for Weight Loss?

Red Light Therapy for Testosterone: How does RLT Boost Testosterone?

The human body can absorb red and near-infrared rays and resultantly boost energy production and transportation in the cells. This mechanism is alternatively known as ATP, which is Adenosine Triphosphate [10]. As red light therapy works for beauty, skin, muscle, and treating other bodily issues, it can effectively be used to treat low testosterone levels in a male’s body. 

Red light therapy stimulates testosterone production by targeting your testicles through the red light and near-infrared light. These red infrared waves start working inside the cells present in your testicles. The energy produced as a result of shooting the red light stimulates processes in the Leydig cells. Resultantly it produces more testosterone. Another reason for increased testosterone production due to Red light therapy involves photoreceptive protein. Human testicles are rich in these proteins which are activated as a result of Red light wavelength. Once these proteins are stimulated, the cells in the testicles start to respond and produce more testosterone .

Safety & Precaution 

There are certain doubts that red light therapy is harmful to testes as it produces heat. But this is true in scenarios where there are longer wavelengths and more absorption of water.  RLT produces little amount of heat, only suitable enough to boost the testosterone level without any harm to the testicles.

From the finding of numerous studies, it is evident that red light is safer than intaking oral or injectable harmful chemicals and stimulants.  Although you do not need a medical prescription to go for an RLT device but depending on your physical condition and particular circumstances, your doctor should be able to evaluate what is the best red light device for testosterone. He can also suggest what wavelengths are suitable for you and what is the safest device available around within your budget. 


Testosterone, the male sex hormone, is important when it comes to the development and maintenance of masculinity. Your overall health conditions, including obesity [11]. and stress level, is dependent on the normal production of this hormone in the body. However due to age or other factors, the levels are being lowered, there are safest options available including the RLT Therapy.

Red light therapy shows a considerable effect on male testosterone, improving sex drive, fertility, and better muscle development.

red light therapy devices for testosterone

In the end, you buy get a red light therapy device to solve all these issues but make sure you talk to your doctor first for any doubts and more satisfying answers.

Written By Matthew Caldera

Matthew Caldera is the founder and CEO of nuYOU LED, a leading provider of red light therapy devices. As a dedicated biohacker and RLT specialist, Matthew aims to make science-backed information about red light therapy and self-improvement more accessible to everyone. To achieve his goal, Matthew uses up-to-date research materials and converts them into easily digestible articles, answering frequently asked questions of those interested in the power of red light.

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  1. University at Buffalo. Light therapy could replace opioids as the main treatment for cancer treatment side effects. 2019 July 9- htps://
  2. Shiel WC Jr. Medical Definition of Testosterone. 2018 December 27-
  3. Wein H. Understanding how testosterone affects men. 2013 September  23-,estradiol%2C%20a%20form%20of%20estrogen.
  4. Health Engine. Testosterone. 2010 February 19-
  5. Sisson M. 9 Factors that affects Testosterone Levels-
  6. European College of Neuropsychopharmacology (ECNP). “Lack of interest in sex successfully treated by exposure to bright light.” 2016 September-
  7. Zupin L. et al. Photobiomodulation therapy for male infertility.  01 June 2020 –\
  8. Preece D. et al . Red light improves spermatozoa motility and does not induce oxidative DNA damage.2017 April 20-
  9. Ross S. et al. The Effects of Low‐Level Laser Light Exposure on Sperm Motion Characteristics and DNA Damage.2013 January, 02-\
  10. Urology of Virginia. The best way to increase testosterone-updated 2019 July 7-
  11. Fui M et al. Lowered testosterone in male obesity: mechanisms, morbidity and management. 2014-;year=2014;volume=16;issue=2;spage=223;epage=231;aulast=Tang

2 thoughts on “Red Light Therapy for Testosterone: Effects & Benefits

    • nuyouled says:

      Hi Mike,

      As our primary guideline, we recommend the below;
      Distance: Apply from 6-12 inches.
      Session Time: Continue for 2-15 minutes, depending on the distance.
      Frequency: Do this 2 times to 4 times a week until results are felt.
      Maintenance: Continue using several times a week.

      Thank you

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