Make and buy your own testosterone molecule t-shirt, hoodie or mug:
Testosterone is a steroid hormone from the androgen group. This chemical is the principal male sex hormone and an anabolic steroid. In men, testosterone plays a key role in the development of male reproductive tissues such as the testis and prostate as well as promoting secondary sexual characteristics such as increased muscle, bone mass and the growth of body-hair. In addition, testosterone is essential for health and well-being as well as the prevention of osteoporosis. (from Wikipedia)
In other words: this chemistry t-shirt will you make you look strong, makes you stronger and also more sexy and healthy ;).
For men only. Women see: Estrogen.