Algerian boxer Imane Khelif, who earlier failed gender eligibility tests, won her opening women's boxing bout at Paris Olympics. Testosterone is a sex hormone produced by both men and women. In men, it's up to 20 times more than women. In women, it ranges from 0.5-2.4 nmol/litre. When people naturally produce excess of sex hormones like testosterone, it's called hyperandrogenism.