Testosterone is an androgen, that is, a male hormone that is responsible for development of the male secondary characteristics at puberty. It is also, found in females but in low quantity. If a female has this hormone in large quantities, she will develop male features such as excessive body hair and small breasts. On the other hand, if a male has this hormone in small quantities, he develops female characteristics such as enlarged breasts. Transgender people have a challenge when they reach puberty. For instance, if a male has been transitioned to be a female, she will need testosterone blockers so that she can develop female characteristics. For such a person, her gender and her body are not in line and they have to be made to be in line. This is facilitated by a testosterone blocker usually referred to as T blocker. One of the best known t blocker for a transgender is the Jungle Dog Labs. This artificial hormone works effectively and it does not have side effects.