Testosterone undecanoate or testosterone undecylate is an ester of testosterone which is used for the treatment of male hypogonadism, and is currently under research for use as a male contraceptive. Testosterone undecanoate is sold and distributed under the brand names Andriol, understor, nebido, pantestone, restandol. Andriol is a version of the anabolic steroid testosterone undecanoate developed by the pharmaceutical company organon. Testosterone is said to enter the body as a fat through the lymphatic system, experience from user indicates that in dose of less than 240mg per day. Effects are negligible, except at every onset of use, while even in higher dose; Effects are still minimal. 
Testosterone undecanoate is therefore thought that most of the steroid is somehow not making it into the blood stream. Testosterone undecanoate is a long-acting man-made version of testosterone, the natural male sexual hormone. Testosterone is responsible for the normal growth and development of male sex organs and characteristics. It includes growth and development of male organs of penis, testicles, prostate, body hair, vocal cord thickening, and muscle and fat distribution.

Uses of Testosterone Undecanote
This medication is used in men who do not make enough of a natural substance called testosterone. Testosterone belongs to a class of drugs known as androgens. Testosterone helps the body to develop and maintain male sexual characteristics (masculinity), such as a deep voice and body hair. It also helps to maintain muscle and prevent bone loss, and is necessary for natural sexual ability/desire.
Testosterone may also be used in certain adolescent boys to cause puberty in those with delayed puberty.
This product should not be used in women.

Properties about Testosterone Undecanote