A BEAUTY treatment jab may help fellas last longer in bed, a study found.

A quarter of blokes struggle with premature ejaculation — with many climaxing within 60 seconds.

Doctors tested injections of hyaluronic acid, commonly found in moisturisers, lip fillers and creams, on 30 men.

Two in three with moderate to severe premature ejaculation responded — lasting 3½ times longer after a round of jabs in the penis.

A month later they could make love for 120 seconds — compared with 34 seconds before.

The acid is thought to work by thickening tissue in the organ, which reduces sensitivity.

Dr Mohamed Ragab, of Cairo University, said in the International Journal of Impotence Research: “Penis injection with the acid is safe and improves sexual satisfaction.”

The average man takes about nine minutes to reach orgasm.

The exact cause of premature ejaculation is unknown.