No, taking steroids during puberty will not make your penis bigger—in fact, it can do the opposite.
Anabolic steroid use during puberty can actually impair normal penile development and cause testicular shrinkage, not increase penile size. The evidence clearly shows that exogenous anabolic steroids disrupt the natural hormonal axis needed for proper genital development.
How Steroids Actually Affect Genital Development
When you take anabolic steroids during puberty, they suppress your body's natural testosterone production through negative feedback on the hypothalamic-pituitary-gonadal axis 1, 2. This creates a condition called "anabolic steroid-induced hypogonadism" 1.
The critical problem: Your penis grows during puberty because of your own testosterone production at the right time and in the right amounts. When you introduce external steroids:
- Testicular atrophy occurs - your testicles shrink because they stop producing their own testosterone 1, 2
- Normal virilization is disrupted - the natural progression of male sexual development is interrupted
- Penile growth may be stunted - particularly if steroids are introduced early in puberty when natural development hasn't completed 3
What the Medical Evidence Shows
The Endocrine Society guidelines specifically note that early suppression of natural puberty "risks limited growth of the penis and scrotum" 3. While this refers to puberty-blocking medications, the principle applies to any disruption of normal pubertal testosterone exposure.
Research on anabolic steroid abuse demonstrates 1:
- Testicular atrophy and destruction of Leydig cells (the cells that make testosterone)
- Azoospermia (no sperm production) or severe oligospermia (very low sperm)
- These effects can persist for months to years after stopping steroids
The Only Exception: Medical Testosterone for Hypogonadism
The only scenario where testosterone increases penile size is in boys with diagnosed hypogonadism (abnormally low natural testosterone) who receive properly dosed medical testosterone replacement 4, 5. In these cases:
- Testosterone induces normal secondary sexual characteristics including "penile enlargement" 4
- Oxandrolone (a specific anabolic steroid) has been shown to increase penile growth in boys with growth retardation 6
- This requires medical supervision with gradual dose escalation to mimic natural puberty 3, 5
This is fundamentally different from steroid abuse - it's replacing what's missing, not adding excess hormones that shut down your natural production.
Critical Pitfalls to Understand
The damage can be long-lasting: Recovery of normal sperm production can take up to 3 years after stopping steroids, and some men never fully recover 1
You're trading potential gains for guaranteed losses: While you might build muscle temporarily, you risk permanent testicular atrophy, erectile dysfunction, and infertility 1, 2
Timing matters: Introducing steroids during puberty (Tanner stages 2-5) is particularly harmful because you're disrupting the one-time developmental window when your genitals are supposed to mature 3
Additional Health Risks
Beyond genital effects, anabolic steroid abuse during adolescence causes 2:
- Acne vulgaris
- Hypertension
- Liver toxicity
- Dyslipidemia (abnormal cholesterol)
- Cardiomyopathy (heart muscle damage)
- Gynecomastia (breast tissue development in males)
The bottom line: Anabolic steroids will not increase your penis size and will likely harm your sexual and reproductive function. Normal penile development requires your body's own testosterone production during puberty, which steroids suppress rather than enhance.