Serena Williams shared an unconventional skincare tip on TikTok, revealing she used her own breast milk to treat a sunburn. “Ok, is this totally weird??? I’ve been using MY breast milk under my eye for a week—and it worked!” she captioned her video.

The former tennis star, who welcomed her second daughter, Adira River, with husband Alexis Ohanian in August, documented her skincare journey. In the clip, she shook a small bottle of breast milk before applying it under her eye with a tissue, saying, “I completely got burned under my eye… Don’t ask.” Williams added, “I’m dying to hear your thoughts. Be nice lol.

She went on to explain how she had been using retinol — a skincare product known to cause sensitivity to the sun — on her “sensitive skin” when she got the sunburn.

“It works for my kid,” Williams — who also shares 6-year-old daughter Olympia with River — said.

“They say put breast milk on everything and I have a lot extra, so I’m gonna try it for a week or so and see how it goes.”

Fortunately, it worked. Williams just didn’t share visual proof.

Still, she’s not the only celebrity who’s documented the healing powers that come from leftover breast milk.

In April, Halsey gushed about using breast milk to heal her own skin.

“It’s so full of antioxidants and good fats and stuff that speed up the healing process,” the singer told Nylon Magazine at the time, calling the liquid the “best skincare ingredient.”

The mother of one, who welcomed son Ender in July 2021, shared how she became more conscious of the products she would put on her face after giving birth.

“When your 𝚋𝚊𝚋𝚢 is kissing you or snuggled up against you, you become hyper-cognizant of what’s on your face,” she shared.