VACAVILLE, Calif. (NBC) -- Women now have a new option when it comes to their love lives.

California women are driving miles to Dr. Justin Salerno's office in Vacaville to receive a shot of collagen that patients say helps them reach climax faster.

"It's a form of human collagen we inject into the vaginal tissues where the G-spot is," Salerno said.

Salerno is one of the only doctors in the nation offering the procedure, known as the G-Shot.

According to thegshot.com, the G-SHOT is a simple, nonsurgical, physician-administered treatment that can temporarily augment the Grafenburg spot in sexually active women with normal sexual function.

Melissa Sherrill said she decided to get the G-Shot to increase her sexual pleasure.

"It didn't hurt at all," Sherrill said.

Salerno said he uses local anesthesia before injecting the FDA-approved collagen.

According to thegshot.com, the actual injection usually takes less than eight seconds and the total office visit time is usually less than 30 minutes.

"I've only offered this eight weeks, but I've been unable to keep up with demand," Salerno said.

The G-Shot costs $1,850 and lasts four months.

Salerno said the shot is designed for women who already have a healthy sex life and want an even better one.

"Way more quickly, and multiple [orgasms], not just one or two, but four or five, which made it a lot better," said a patient who did not want to be identified.

Psychologist and sex therapist Dr. Bryna Barsky-Ex of Kaiser Permanente does not recommend the G-Shot.

"I think getting addicted to the $1,800 every four months just to be able to function sexually is problematic. There are a lot of ways to get pleasure. Women really don't need a shot to be able to do it," Barsky-Ex said.

Barsky-Ex said she's concerned about the lack of studies looking at the possible long-term side effects of the injection.

"Once you've had it this good, you don't want to go back," said one patient.

Sherrill said she is looking forward to the same results.

"Better sex, better sex life with my partner. The main thing is it gives me a boost of self esteem," Sherrill said.

According to thegshot.com, results may vary. The site lists 68 risks that are associated with the procedure, ranging from bleeding to nodule formation.