When Sascha Green goes to Costco, she buys ground porkgrand finity play, turkey and chicken breasts for a week of dinners. And then she gets steak for her face.

It may seem gross, but beef tallow — rendered fat from around a cow’s organs — has become a popular ingredient in cosmetic products. Customers swear by its natural moisturizing properties while businesses have begun selling tallow-based creams to meet the demand. But dermatologists warn that just because something’s natural doesn’t mean you should put it on your face.

“I give it a thumbs down from the scientific and dermatologic perspective,” said Dr. Zakia Rahman, a clinical professor of dermatology at Stanford University School of Medicine. “It could potentially cause acne flares or cause irritation.”

Still, many people swear by its benefits. Last year, Ms. Green, 28, stopped spending a fortune on a litany of skin care products when she started seeing TikToks from people promoting what they described as a natural miracle ingredient that’s cheaper than Sephora products.

“I made my own to start, just by getting meat from Costco and stripping the fat off the meat and rendering it,” said Ms. Green, who lives in Hillsdale, Ind., about 70 miles west of Indianapolis.

In a video documenting her process, she cooked the fat repeatedly with water and salt, removing brown-colored impurities until she was left with a white, waxy disk. She then whipped it up with essential oils and declared it ready.

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The reception had none of the hype that accompanied President Biden’s mega-fund-raiser at Radio City Music Hall in March or his big Hollywood bash in June, but Ms. Harris’s event raised a similar figure as each of those. At the same time, the dizzying amount that Ms. Harris has raised during her two months as a presidential nominee can make even a $27 million fund-raiser feel somehow less than remarkable.

Tributes to Judge Mullins poured in on social media over the weekend, from friends, relatives and others who simply knew him as a judge. Some posted memories of him chatting with colleagues outside the courthouse on smoke breaks and talking about his love for his wife and two daughters.

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