his memoir “Greenlights” and a recent interview with LADbible, the “Dallas Buyers Club” star said he started to shave his head many years ago because the hair-thinning was so severe.However, he remarkably was able to reverse it.“How did it grow back? That’s a great mystery,” McConaughey told the outlet, adding that he rubbed a “topical ointment” into his scalp once a day. “I was fully committed, I was fully committed to it — no Propecia, no nothing, it was just manual labor,” the Texas native said.