The rise of the G-shot jab, which claims to revolutionise sex lives, could actually do more harm than good, doctors warn.

According to an article from the Daily Mail, doctors say there's no conclusive medical evidence to support the claims attributed to the cosmetic-filler injection. Instead, they fear that it could cause harmful side-effects and mar women's sexual responses instead.

The G-shot jab, which was invented by Los Angeles plastic surgeon Dr David Matlock, involves pumping collagen into the inner wall of the vagina (where the G-spot is supposedly located), to increase the size of the G-spot, thereby apparently boosting the regularity and intensity of female orgasms.

The 30-minute treatment costs just over R11 000, and since its launch, more than 2000 women in the US have reportedly undergone the procedure.

But many doctors are worried about the validity of the claims of the jab's benefits, and say there's no conclusive evidence to back them, or the safety of the G-shot.

Dr Petra Boynton, a senior lecturer in international healthcare research at the University College of London, was quoted as saying the G-shot method was "unsubstantiated by any serious research", while consultant plastic surgeon Paul Banwell, a member of the British Association of Aesthetic Plastic Surgeons, was quoted as saying to the Daily Mail: "I don't offer it, I don't support it, and we just don't know enough about possible side-effects, such as scarring and a reduction of libido over time."

However, British cosmetic doctor Lucy Glancey told the Daily Mail that the G-shot injections result in a high sexual satisfaction rate in customers.

Glancey, who introduced the injections at her Glancey Medical Associates clinic in Britain three years ago, says she had performed 150 procedures thus far and the process itself is "safe enough".

In the Daily Mail article, Glancey says that the g-spot does exist, is very simple to find and that most women know where the area is. "I just confirm it," she was quoted as saying. Once the area has been located, Glancey injects hyaluronic acid into it so that it is easier to feel.

But Dr Banwell rejected this, saying: "You cannot increase the size of the spot simply by putting filler into the flesh there. It's a myth and it doesn't even make sense. We also know that when you stretch flesh or skin it normally becomes less sensitive, even numb."

He also argues that there is a large placebo effect in the cases of women claiming that the injections revolutionised their sex lives – something Dr Boyton agrees with.

"They have spent a lot of money on the procedure so they have a big financial and emotional investment in believing it will work," she told the Daily Mail. "But talking, reading a self-help book or even seeing a sex therapist is far cheaper, probably more effective and less risky than having an invasive procedure."