For the steroid user, this steroid can almost be called essential to an off-season mass plan. But when we look at what it can do for recovery and healing it is almost in a class of its own. Couple this with its side effect friendly nature and this steroid is very hard to beat. However, there’s one important thing we’ve yet to address, erectile dysfunction. Nandrolone is well known for causing erectile dysfunction, often referred to as “ Deca Dick.” This isn’t the hormone’s fault; it is due to improper use. As a progestin and a hormone that can produce prolactin erection function can be diminished. Keep a balance in your hormone levels and there won’t be an issue.
After the Kefauver Harris Amendment was passed in 1962, the . FDA began the DESI review process to ensure the safety and efficacy of drugs approved under the more lenient pre-1962 standards, including Dianabol.  In 1965, the FDA pressured CIBA to further document its legitimate medical uses, and re-approved the drug for treating post-menopausal osteoporosis and pituitary-deficient dwarfism .  After CIBA's patent exclusivity period lapsed, other manufacturers began to market generic metandienone in the .
This is largely because of the anti-steroid stance taken by the FDA and almost all other governing bodies in regards to anabolic steroid use – researchers don’t particularly want to go anywhere near prohormones and steroids to perform studies. They’re too much of a “taboo” substance. As such, we currently have no idea why prolactin-like side effects take place when using nandrolone and trenbolone; theories include a hypothesis that it somehow stimulates the pituitary gland to release prolactin, whereas others state that 19-nor steroids must interact in an unknown way with one’s biochemistry to produce these effects.