No, testosterone does not directly increase height in adults. However, its indirect influence on growth during puberty is significant.
Testosterone's Role in Height Growth
Testosterone plays a crucial role in puberty's growth spurt. While not a growth hormone itself, it stimulates the production of growth hormone (HGH) and insulin-like growth factor 1 (IGF-1), both vital for bone growth. This is why individuals with low testosterone (hypogonadism) may experience delayed puberty and reduced growth. A study demonstrated that a gradual increase in testosterone dosage during a prolonged period can lead to increased adult height. This effect is largely observed in adolescents whose growth plates haven't fully closed. ([1], [3], [9], [10]) Once the growth plates fuse (typically in late teens/early twenties), further height increase is impossible, regardless of testosterone levels. ([6])
Timing is Key
The impact of testosterone on height is heavily dependent on timing. During puberty, the hormonal surge, including testosterone, promotes significant growth. However, this effect is indirect; testosterone facilitates the action of other hormones directly responsible for growth. ([2]) After puberty, growth plates fuse, and further height gain is impossible, regardless of testosterone levels. ([6], [11])
Testosterone Therapy and Height
While testosterone replacement therapy (TRT) in adults helps manage testosterone deficiency, it will not increase height. TRT addresses other symptoms of low testosterone, such as reduced libido and muscle mass, but it doesn't affect bone growth. ([11]) In adolescents, carefully managed testosterone therapy might positively influence height growth if administered correctly during the ongoing growth period. However, this effect is not guaranteed and depends on various factors including individual genetics and the precise treatment regimen. ([1])
Conclusion
Testosterone's influence on height is primarily indirect and limited to the pubertal growth period. Once growth plates fuse, increasing testosterone levels will not increase height.
