The discovery of syringes in murder-accused Oscar Pistorius's house was "odd," sport scientist Ross Tucker said on Friday.
"I believe they did send the substance for testing, and presumably also checked the syringes, which I still find odd," said Tucker, a researcher at the Sport Science Institute.
"You normally ingest those kinds of herbal or supplement products orally, not through injection."
Pistorius is accused of murdering his girlfriend Reeva Steenkamp in his home last week.
Warrant officer Hilton Botha, who has since been removed from the investigation team, told the Pretoria Magistrate's Court this week that boxes of testosterone and injection needles were found in Pistorius's house.
Pistorius's lawyer, Barry Roux, told the court that the testosterone, called testoconpasutiun coenzyme, was a herbal remedy and was not banned.
Tucker said he had never before heard of the substance mentioned in court.