The infamous mugshot from 1999 clearly shows him receding and thinning at the front.
10 years later, he appears to have a lot more hair. What could have caused this reverse balding?

McConaughey himself attributed his hair regrowth to a product called Regenix on the David Letterman show a few years back.
Those on the hairloss forums are not convinced, with a hair transplant or even a hairpiece given as more likely explanations.
Norwood Rating : 3