Prince William is so worried about his thinning hair he is considering using a growth treatment, according to reports.

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The 25-year-old royal is said to have sent an aide to a top Harley Street clinic, in London, to get information about a product called Propecia. Propecia claims to stimulate follicle growth and is used in the treatment of male baldness.

A source at the clinic told the Daily Mail: “We received a visit from a member of staff from Clarence House (William’s London residence) asking very in-depth questions about hair loss.

“He said it was for a VIP client who he couldn’t say much about but, from the detail he did provide, it seemed very likely he was talking about William.”

William, who is currently training to become a pilot with the Royal Air Force (RAF), is believed to be so paranoid he regularly wears a baseball cap to hide his thinning crown. One of the prince’s friends revealed: “He is so sensitive about his hair. I am afraid it is thinning rather badly.”

A spokesman for Clarence House has insisted Prince William did not send an aide to the clinic.