A lot of people have been wondering if US President Donald Trump's famous locks are real, or if he's just wearing a wig, or if had implants. However, his longtime doctor has now revealed the secret to Trump's hair.

Dr. Harold N. Bornstein said that to promote hair growth, President Trump takes medication for three ailments, including a prostate-related drug. The physician said that the other drugs are antibiotics to control rosacea, and a statin for elevated blood cholesterol and lipids, New York Times reported.

According to Telegraph, the small dose of the prostate-related drug Propecia stimulates hair growth. Dr. Bornstein confirmed, though, that the President's hair is real, but the drug Propecia, which lowers levels of prostate-specific antigen, helped to grow his locks and maintain his characteristic blonde hairdo.

The drug is marketed as a treatment for male baldness, and its common side effects include erectile dysfunction, ejaculation disorder, and decreased libido. Dr. Bornstein said that he also takes the drug, saying that it has allowed him to keep his own shoulder-length mane.

The doctor said that Trump is healthy and "up to date" on his checkups. Dr. Bornstein has been the President's physician since 1980, and he first stepped into the spotlight when he released a short letter about the President's health in December 2015.

In the letter, he said that if elected, Trump will be the healthiest individual ever elected to the presidency. In September of last year, he released another statement revealing a few details about the future President, such as his weight, height and blood pressure.

Dr. Bornstein also said that Donald Trump takes an aspirin a day to reduce the risk of stroke, and to alleviate rosacea - an ailment that causes redness to the nose, cheeks, chin and forehead, Trump takes antibiotics. The White House did not immediately respond to make a comment.