Simon Cowell enjoys twice-yearly Botox, regular colonic irrigation and vitamin injections to keep him looking young, according to his unofficial biography.

In the latest extract of Sweet Revenge: The Intimate Life Of Simon Cowell, which is being serialised in The Sun, the Britain’s Got Talent and US X Factor judge is said to use black loo roll in his bathroom and have a feature in his garden that makes him look as though he can walk on water.

The book, by Tom Bower, said that Simon has ‘life-enhancing’ fresh fruit sent to him by air freight and drinks two smoothies a day made from exotic plants.

The Britain’s Got Talent creator also has massages, chest waxes, wears tooth caps and dyes his hair, according to the book, which previously revealed he had a fling with Dannii Minogue.

According to Bower, the TV talent show supremo is put on an intravenous drip in his bedroom every Saturday afternoon, whenever he is in the US, to pump magnesium, B vitamins and pure vitamin C into his bloodstream.

He is also said to travel everywhere with two large suitcases packed with potions, eye drops, face creams, bath salts, lotions and shampoo.

On Tuesday, Simon’s publicist Max Clifford said he was ‘disappointed’ his client had co-operated with the writer on the book and said it had been a ‘massive own goal’.

Simon himself posted a message on Twitter to point out that this was not an official biography although he did not deny he had taken part in the book’s preparation.

He said: “This book is not written by me. It is unauthorised. The writer is Tom Bower.”