Scientists warn that chemicals from everyday life are permanently harming our ability to reproduce, while causing a host of other physical and neurological conditions.
Semenya's case has provoked a furious debate across sport worldwide about gender and "hyperandrogenic" athletes, those with "differences of sexual development".
The 28-year-old South African won her last 800 metre race on Friday before the introduction of the rules by the IAAF come into effect on May 8.
The Court of Arbitration for Sport has ruled that South Africa’s Olympic-winning athlete Caster Semenya will have to take pills to suppress the natural levels of testosterone in her body if she wants to continue competing as a female.
The IAAF believes female runners with high testosterone levels have an unfair advantage in events from 400 meters to the mile.
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