Donald Trump's hair has been the subject of much speculation ever since he started his presidential campaign.

He even let television presenter Jimmy Fallon ruffle his famous locks to prove they were real and that he wasn't wearing a wig.

However, his longtime doctor has now made claims about the President's hair in a series of interviews with the New York Times.

According to Dr Harold Bornstein, Mr Trump takes a small dose of a prostate-related drug that stimulates hair growth.