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Can Testosterone Affect Penis Size?

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Testosterone boosters are one of the most widely used supplements in male health and performance.

There are numerous reasons why. They help you boost strength and muscle mass, improve athleticism and increase both physical and sexual performance.

For many men though, increasing penis size is a big thing. And many wonder if testosterone supplements can help you achieve this.

In this article we take a look at the relationship between testosterone production and penis length.

Here’s what we’ll cover:

  • Penis growth during puberty and development
  • Testosterone as a regulator of penis size
  • Libido and erectile dysfunction: the testosterone relationship

Penis Growth and Development

Young boys are very similar to young girls. In fact, research suggests that before the age of 11 there aren’t really any differences between them in size or muscle strength at all [1].

But as soon as you hit puberty you started to see some drastic changes to your body. You started to become a man.

Over the 6 years or so it took you to mature, you saw big increases in the androgen hormone testosterone. And it was this hormone that is responsible for guiding you into manhood.

What is testosterone?

T is a hormone released from the Leydig cells of the testes. It is a natural steroid that control masculinity. It regulates not only physical characteristics such as strength and muscle mass, but also libido and sperm production too.

And just when you thought it couldn’t get any more important, T is a major player in regulating your health. It ensures strong bones and also reduces risk of metabolic and cardiovascular diseases.

Testosterone levels increase dramatically between the ages of around 11 and 18 and remain high up until your late twenties. By thirty years old though, your T levels begin to decline by around 1% per year.

How does testosterone affect your development?

Prior to puberty, T concentrations are similar to that of girls, but as you reach pubertal age it begins to increase rapidly in production.

This happens because a specific part of the brain called the hypothalamus has triggered your testes into releasing more testosterone. From there you begin your journey of physical development.

Puberty stages

Once the hypothalamus triggers an increase  in testosterone release, puberty is initiated. Although the duration and exact timings differ between boys, puberty follows a typical sequence:

  • Stage 1: Development of testes and growth spurt
  • Stage 2: Body shape changes and muscle tissue increases. Testes continue to grow
  • Stage 3: The penis starts to grow in length. Pubic hair begins to grow too
  • Stage 4: Penis starts to grow in width. Facial/body develops and voice deepens.
  • Stage 5: Full adult height reached. Both the penis and testes are fully developed.

Key Point: Testosterone is responsible for triggering penile growth as well as other masculine characteristics.

Testosterone and Penis Size

A question that many men have is once you have reached puberty and your male characteristics are set, does testosterone affect your penis size during adulthood?

The answer is unfortunately, no.

Your penis size can’t be changed

As we’ve seen already, the main hormone responsible for growth of your penis is testosterone. But once you move past puberty you’re pretty much set for life.

You may still have high testosterone throughout your twenties, but instead of continuing growth of your gonadal area it is instead prioritized to help regulate other characteristics.

Unfortunately the only thing that controls your penis size is genetics.

Penis size is determined during fetal development

Whilst those with normal T levels can’t change the size of their penis, it does appear that low testosterone levels could be a factor in under-development of your reproductive organ.

Hypogonadism is otherwise referred to as low T. It is characterized by having testosterone levels of lower than 300 ng.dL.

And you are affected by testosterone even when you are in the womb. It helps to regulate organ growth and even helps decide which gender you’ll be.

There is research to suggest that having a smaller-than-normal penis may be linked to low testosterone during fetal development.

A study published in the Journal of Pediatrics [2] found that when a group of infants suffering from a condition called micropenis were given testosterone supplementation, they were able to develop normally into adulthood.

So if you give specific steroids to children it can prevent smaller-than-average penis development. But again though, give male-enhancing supplements to those with normal development and you’ll se no benefits.

Key Point: Testosterone won’t change the size of your penis. It is determined with genetics and during early fetal development.

Boosting Your T Levels Will Increase Libido Though

Whilst testosterone boosting supplements might not effect your penis directly, they will increase your libido and sexual performance.

Low T levels have been found to be one of the leading causes of low sex drive.

A large study of over 1,600 men based in greater Boston, Massachusetts found that 19% of them had low libido [3]. And there was a significant relationship between those that reported low libido and the chances of them having low testosterone levels.

“T supplementation was associated with increases in sexual functioning, mood, and strength” [3].

And you’ll get more regular and stronger erections too

A study published in Reviews in Urology [4] reported that the inability to gain an erection is linked to low testosterone levels.

The research team who led the study suggested that hypogonadism was one of the main causes of hormonal erectile dysfunction, but that treatment with testosterone boosting supplements helped sexual function return to normal. 

“Erections are clearly testosterone-dependent, as evidenced by the observation that men with hypogonadism have a marked reduction in the frequency, amplitude, and rigidity of erections”.

Key Point: Optimizing your testosterone levels helps you maintain strong erections and a healthy sexual appetite.

How Do You Boost Your Testosterone Levels?

Nutrients such as zinc, vitamin D and D-Aspartic acid have all been shown to optimize testosterone production in robust clinical trials.

TestoFuel provides you with all of the building blocks needed to fuel your physical needs. Whether it’s to ramp up your libido or pack on slabs of muscle, this all-natural supplementation will optimize masculinity.

  • Increased Energy work out harder for longer in the gym and in the bedroom
  • Muscle Growth and Strength – feel stronger and look better. Bigger lifts and more size
  • Libido enhancing – Improve confidence, endurance and sex drive
  • Recover Better – Go again and again. A bigger sexual appetite and better gains in the gym

TestoFuel is an ideal, natural supplement specifically designed to give you all of the benefits with none of the side effects.


  1. Seger, JY et al. Muscle strength and electromyogram in boys and girls followed through puberty. Eur J Appl Physiol. 2000; 81(1-2): 54-61
  2. Bin-Abass, B et al. Congenital hypogonadotropic hypogonadism and micropenis: effect of testosterone treatment on adult penile size why sex reversal is not indicated. J Pediatr. 1999; 134(5): 579-83
  3. Travison, GT et al. The relationship between libido and testosterone levels in aging men. J Clin Endocrinol Metab. 2006; 91(7): 2509-2513
  4. Rajfer, J. Relationship Between Testosterone and Erectile Dysfunction. Rev Urol. 2000; 2(2): 122–128