Gwyneth Paltrow
Actress Gwyneth Paltrow arrives at the 87th Academy Awards in Hollywood, California, Feb. 22, 2015. REUTERS/Lucas Jackson

Gwyneth Paltrow’s lifestyle website Goop — famous for its controversial health advice like vaginal steaming and “Moon Juice” — has a new tip for women looking to have better sex, putting jade eggs in your vagina. The claim, however, has been disputed by doctors.

In a blog post titled “Better Sex: Jade Eggs for Your Yoni,” the website claims the trick is a “strictly guarded secret of Chinese royalty in antiquity — queens and concubines used them to stay in shape for emperors — jade eggs harness the power of energy work, crystal healing, and a Kegel-like physical practice. ”

The eggs are available on the website for $66 and are currently listed as sold out.

“Fans say regular use increases chi, orgasms, vaginal muscle tone, hormonal balance, and feminine energy in general ,” Goop claims in the post, but doctors are not impressed.

“I read the post on GOOP and all I can tell you is it is the biggest load of garbage I have read on your site since vaginal steaming,” Dr. Jen Gunter, an obstetrician and gynecologist (OB-GYN) for Kaiser Permanente in San Francisco, wrote in an open letter to the actress. “Nothing says female empowerment more than the only reason to do this is for your man!”

Gunter went on to emphasize potential health risks associated with the vaginal use of the eggs as advertised.

“As for the recommendation that women sleep with a jade egg in their vaginas I would like to point out that jade is porous which could allow bacteria to get inside and so the egg could act like a fomite,” Gunter wrote. “This is not good, in case you were wondering. It could be a risk factor for bacterial vaginosis or even the potentially deadly toxic shock syndrome. ”

Other doctors have also voiced their apprehension regarding the use of these jade eggs that Iranian-American actress and healthy living blogger Shiva Rose swears by.

“Given that these jade eggs are not FDA-approved and there are no medical studies that can support [these claims] I could not recommend this to any of my patients,” Dr. Christine Greeves, an OB-GYN at the Winnie Palmer Hospital for Women and Babies at Orlando Health, told CBS News.

She noted that the vagina did not require “detoxing” and for assistance with orgasms, women may see a doctor who is qualified to answer related questions.

The list of doctors slamming the technique is much longer.

“There are no studies or evidence to show that jade eggs help with orgasms, vaginal muscle tone or hormonal balance,” Dr. Leena Nathan, an assistant OB-GYN clinic professor at UCLA Health, told Fox News. “Jade does not result in hormonal changes even when inserted in the vagina.”

Women are advised to consult a physician before trying any such hacks for vaginal health.