Yes, the product is legal is the USA.
It only poses a problem when transferred to very young children. Minimal transfer to others during sex or sport will not pose a problem for a grown adult. (male or female)
Honestly, you wont notice as much from dermacrine unless you on the low/normal range of test. If you havnt touched any steroids and are a healthy guy, your hormones are probably still very high. On the contrary, many 19 yr olds may actually have low test from drinking, stress, excess bodyfat, high estrogen, ect. In this case, they would benefit from dermacrine.
Some of our Dermacrine users had a slight increase in estrogen accompanied by massive increase in testosterone and other androgens. If your worried about premature closure of your epiphyseal plates, its best to avoid hormonal products all together.
-Pp