Lawyers for Oscar Pistorius have identified the substance found in his bedroom after he shot dead his girlfriend as Testis compositum, and say it is a herbal remedy used "in aid of muscle recovery".
A product called Testis compositum is also marketed as a sexual enhancer, good for lack of stamina. Some online retailers advertise oral and injectable forms as testosterone boosters.
South African police say they found needles in Pistorius' bedroom along with the substance, which they initially named as testosterone. Prosecutors later withdrew that said it had been sent for lab tests.
A Pistorius family spokeswoman said that the athlete's lawyers confirmed that the substance is Testis compositum.
In court last week, Pistorius' defence lawyer Barry Roux said the substance was not banned by sports authorities, but it had been unclear what it was and what the exact name was.
A product called Testis Compositum is made by Biologische Heilmittel Heel, based in Baden-Baden, Germany. The company website says it is one of the world's leading makers of homeopathic combination medications.
A US subsidiary, Heel USA, markets the product in tablet form only. Heel USA's website says the product provides temporary relief for men's "sexual weakness" and lack of stamina.
The US-sold tablets contain 23 ingredients, including pig testicles, pig heart, pig embryo and pig adrenal gland, cortisone, ginseng and other botanicals. It also contains several minerals.
Professor Charles Yesalis, an expert on steroid use in sports, said animal steroids would not be likely to have an athletic performance-enhancing effect unless taken in huge quantities. Even so, he said many elite athletes would be wary of using such supplements because they can be laced with banned substances and few would want to risk it.
Pistorius was charged with premeditated murder in the February 14 death of girlfriend Reeva Steenkamp. He says he shot her by accident after mistaking her for an intruder in his home.