A celebrity facialist to the stars has revealed her secret weapon for fresh, glowing skin: human semen.

Chelsee Lewis, who has been in the beauty industry for over 22 years, says she's worked with celebrities like Stella McCartney and Gwyneth Paltrow.

Penning a guide to skincare for the Daily Mail, Lewis revealed some of her best kept secrets - including applying sperm to reduce acne and wrinkles.

"Sexual intercourse helps the stress hormone but also helps to balance the hormones and improve collagen production. But you can go one step further with a sperm mask. Yes, you heard right!" she wrote for the news outlet.

"Using your partner's sperm as a mask is full of a compound called spermine, which is an antioxidant which can help reduce wrinkles, smooth the skin, prevent acne or spots and give you overall healthy-looking skin."

Lewis is not the first to promote sperm facials. Former Cosmopolitan editor-in-chief Helen Gurley Brown famously advised women to "spread semen over your face [because it's] probably full of protein as sperm can eventually become babies. Makes a fine mask - and he'll be pleased."

However, dermatologist Doris Day told Cosmopolitan she has doubts about the benefits of rubbing semen into one's face.

"It's not necessarily something that can penetrate the skin in any way beyond what a regular moisturiser can do," she says.

"The water in the semen, as it dries off on your skin, could leave your skin drier. If you have rosacea, you should be careful."

Lewis didn't give the Daily Mail specifics on how exactly she recommends getting the sperm onto the face - perhaps a case of personal preference.

She also included some more mainstream advice, like splashing iced water on your skin.

"Fill the sink with ice cubes and cold water and splash the face 15 to 20 times before applying your makeup," she recommends.

"It will leave your skin feeling tighter and brighter, and your makeup will sit beautifully."

In 2018, it became rather du jour for celebrities to get foreskin facials - a treatment derived from stem cells taken from the discarded foreskins of newborn babies in Korea.

That treatment cost about US$650.

Newshub.