Beef tallow has quietly migrated from kitchen pantries to vanity tables, and one of the biggest endorsements thus far has come from none other than Khloé Kardashian. The 41-year-old Good American cofounder recently revealed she rubs beef tallow for skin care around her eyes at night - a practice she swears helps keep nighttime wrinkles at bay. Her endorsement adds fuel to a viral trend that's been simmering on TikTok and Instagram for several years, even as dermatologists everywhere urge caution.