Gladiator sweat was used as a skin beauty product in Ancient Rome!
Ancient Rome is well-known for many things: the Coliseum, gladiators, powerful emperors. What it is not as well-known for is beauty products. For good reason too. It turns out that the women of ancient Rome had some very quirky beauty routines.
Sweat from gladiators and fat from the animals that fought in the arena were sold in souvenir pots outside the arena. Apparently, it would improve a woman's complexion.
Other, more normal makeup was usually sold in tablet or cake form. Wealthy women could afford eye shadows and liners of sorts. Makeup was usually associated with prostitutes though and was considered immoral and seductive.
But I guess wearing the sweat of a gladiator was considered just fine.