Does Growth Hormone Affect Penis Size in Adults?

What Is Penis Growth Hormone, and Can It Make Your Penis Bigger?

Key Points About How Does Growth Hormone Affect Penis SizeFor some men, the possibility of enlarging their penis is a desirable prospect. If you are one of those men, you may have heard about penis growth hormone (PGH). 

What is penis growth hormone, and can it make your penis bigger?

PGH can mean testosterone or human growth hormone (HGH), depending on who you ask or what you read. Both hormones play a role in growth, muscle size, bone density, and male development. However, that does not mean they can influence changes in penis size once a man has reached physical maturity. 

Now, do not turn away quite yet. We have to look at what happens if you have a hormone deficiency. Does growth hormone make your penis bigger if you are HGH deficient? Will testosterone therapy help if you have low testosterone levels?

We uncover those answers and more in this in-depth review.

What Is Penis Growth Hormone?

As we begin our research into the possibility of a growth hormone for penis size, it is natural that testosterone and human growth hormone are the first things most men think about. After all, both hormones influence testicular functions, muscle growth, circulation, and other factors that may affect penis growth. 

Penile growth occurs during puberty when testosterone and HGH are at their highest secretion levels. These hormones not only fuel the attainment of adult height but also stimulate testicular and penile growth and development. 

One of the reasons men ask does human growth hormone increase penis size is due to all the research and studies on boys with micropenis. A micropenis is defined as having a stretched length of 2.5 standard deviations less than that age’s mean size. Of course, that is without other anomalies or issues associated with penile growth. 

One study featured two distinctly different treatments based on the age of the boys:

  • Children under 11 years received 25 mg of parenteral testosterone enanthate once monthly for 3 months. Following treatment, their stretched penile length increased from 15.54 mm to 37.18 mm.
  • Boys aged 11 and older received intramuscular injections of 1,500 to 2,000 IU human chorionic gonadotropin (HCG) once a week for six weeks. Following treatment, stretched penile length increased from 26.42 mm to 64.28 mm. HCG is a hormone that stimulates testosterone and sperm production.

Another study looked at the use of human growth hormone for boys with HGH deficiency and below-normal penis length. Boys with hereditary isolated GHD had a more significant penile size deficit than those with sporadic cases. HGH treatment improved penile length in all but two of the 20 boys in the study. It also increased testicular size. 

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How Does Penis Growth Hormone Work?

Let us look at ALL the hormones that influence sexual health in males, not just HGH, and testosterone. Gonadotrophin-releasing hormone (GnRH), luteinizing hormone (LH), and follicle-stimulating hormone (FSH) play a significant role in male sexual development. 

  • Gonadotrophin-releasing hormone: 

Produced and secreted by the hypothalamus, GnRH stimulates the pituitary gland to produce FSH and LH. These hormones act on the testes to regulate sperm production. Puberty increases GnRH production, stimulating sexual maturation. Low GnRH levels in boys can delay and interfere with puberty and sexual development. 

Hypogonadotropic hypogonadism (HH) occurs when the testes cannot produce adequate sex hormones due to a problem with the hypothalamus or pituitary gland. In a study of adolescent boys comparing the benefits of GnRH treatment to HCG, the differences were considerable. 

The average age of the boys receiving GnRH was 13.39 +/- 1.66 years. The average age of the boys receiving HCG was 13.89 +/- 2.44 years. At 12 months of treatment, both treatments increased penile length, but GnRH was more effective in treating young males. 

What about the effect of GnRH on adult males? Another study looked at 22 patients with an average age of 20.5 years +/- 12.1 months. GnRH treatment increased LH, FSH, testosterone, testicular volume, and penis length. However, there are no available studies on older men. 

  • Luteinizing hormone:

Produced by the pituitary gland in response to signals from GnRH, luteinizing hormone stimulates testosterone production in the testes’ Leydig cells. LH and HCG bind to a luteinizing hormone/choriogonadotropin receptor (LHCGR). LHCGRs are expressed in the testes throughout life, enabling LH to stimulate testosterone production and promoting induction and maintenance of penile growth and other secondary sexual features. Further studies are necessary to determine the influence of LH and LHCGR in later years and their impact on penile size and functions.

  • Follicle-stimulating hormone:

Also produced by the pituitary gland at the stimulation of GnRH, FSH promotes spermatogenesis (sperm production) in the Sertoli cells in the testes. FSH deficiency can delay puberty. 

What about testosterone and HGH – does growth hormone affect penis size if an adult male is deficient in this hormone?

All hormones mentioned, including HGH and testosterone, influence penile growth during adolescence. When a man reaches full growth and height, hormone replacement therapy rarely makes the penis any larger. The influence mentioned earlier about GnRH is in males in their early twenties. It is recommended that a male seek medical assistance before he enters his twenties to provide the best possible outcome. 

Can Testosterone or HGH Make Your Penis Bigger in Adulthood? 

There is more to penile functions than size. When asking does growth hormone increase penis size, we need to also look at men dealing with erectile dysfunction (ED). ED is an ongoing inability to achieve or maintain a satisfactory erection for sexual intercourse. ED takes on many forms, including loss of the morning erection and the inability to achieve multiple erections in one night. These changes can cause emotional and relationship problems for some men. 

Testosterone replacement therapy (TRT) is often used to treat ED symptoms and other issues associated with low testosterone levels (andropause). Because of the mutual influence of testosterone and HGH on one another, some men with low human growth hormone levels find that HGH therapy improves their erectile functions. Also, since HGH stimulates testosterone in the testes, it can, directly and indirectly, impact spermatogenesis in a way that supplemental testosterone cannot accomplish. 

Testosterone is a direct red blood cell production stimulator, which is crucial for proper circulation. Anemia, a condition associated with low red blood cell count, improves with TRT. For a man to achieve a full and lasting erection, proper blood flow must reach the penis. That is why some men feel that their penis size increases with hormone replacement, as engorgement can occur again in ways it may not have in many years.

HGH also increases nitrous oxide levels

Finding the right hormone treatment requires comprehensive blood analysis and review by a hormone specialist. The best options for both are injections. HGH is only available as an injectable. Although also available in other forms, testosterone achieves the best absorption and results in its injectable state. 

Is There Anything You Can Do to Increase Your Penis Size?

Penis size depends on many factors, including genetics, hormones, environment, diet, and nutrition. 

Genetics is the first factor we examine. Of the 23 pairs of chromosomes, only one set is of sex chromosomes. Males receive one X chromosome from their female parent and one Y chromosome from their male parent. The Y chromosome houses between 70 and 200 genes and determines penile and testicular development, though not necessarily girth or size. So, while genetics may play a role in determining penile size, it is not the sole factor. 

Hormones released during puberty, including HGH, HCG, LH, FSH, and testosterone, contribute to penile and testicular growth. Pregnancy variations in testosterone levels may result in penile abnormalities, especially if the mother does not produce enough HCG. 

Environmental factors, including endocrine-disrupting chemicals such as plasticizers, phthalates, and pesticides, may affect gene and hormone expression. Phytoestrogens play a role in many sexual factors throughout life. 

Dietary factors, including malnutrition in the womb and during adolescence, can interfere with puberty and penile growth. 

Penile growth typically ends by age 19, although some males may still experience growth into their early twenties. 

Although it may sound cliché, it is not always the size of the penis that leads to satisfying sexual relations for both parties. A consult with a urologist may help you understand if penis size or another factor is a concern. Speaking with a hormone specialist can assist in detecting if a hormonal imbalance is interfering with erectile functions and satisfaction.

Other Methods of Penile Enhancement

Some men look to advertised methods to increase their penis size in later years. Vacuum devices, penis traction devices, creams, pills, and enlargement procedures have limited research and many serious risks.

Potential Problems with other Penile Enhancement

While certain types of penile augmentation surgery by a urologist exist, it is vital to meet with a specialist to discuss your situation before risking any damage to your penis.


It is not uncommon for some men to have self-confidence issues over the size of their penis, erectile functions, stamina, premature ejaculation, or other areas of erectile dysfunction. The answer is not in over-the-counter pills purchased at the neighborhood gas station, off online ads, or from someone at the gym. Nor is it safe to resort to non-medically supervised products or services.

For some men, the answer to better erectile functions and satisfying sex may lie in treatment with supplemental testosterone or human growth hormone. Penis size may be something you have to live with once you reach your mid-twenties, but that does not have to prevent you from having a great sex life. 

Contact our hormone therapy clinic to speak with a specialist to find the treatment that best meets your body’s needs. 

Get in touch

Please get in touch and our expert support team will answer all your questions about HGH therapy.

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Brooklyn, New York 11224

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