It isn't as if Daytona hasn't seen any estrogen alongwith all that testosterone. (No, these are not new products from Pennzoil.) As far back as 1977, a true trailblazer, Janet Guthrie, drove in the 500.
Alongwith Tobias, fellow Ukrainian Antonina Yefremova was charged after synthetic testosterone was found in their systems, while Bulgaria's Inna Eftimova tested positive for a synthetic growth hormone.
Unfortunately, this statistic cuts like a knife the other way as well: research also shows that low testosterone in men is linked to weight gain, Type 2 diabetes and cardiovascular disease (along with poor sexual performance).