One week, one 100% beef tallow moisturizer, and a face full of surprises.

From slugging to salmon sperm facials to anti-wrinkle straws, internet beauty culture has never shied away from the unconventional. But few trends have sparked as much divided reaction as the recent rush to slather rendered beef fat directly onto the face.

Beef tallow’s skincare moment isn’t entirely new — traditional beauty routines have used animal fat for generations. What’s changed is the scale of enthusiasm online, where creators now credit the greasy substance with clearing acne, fading discoloration, and delivering an overall glow. Skeptical but curious, I decided to test the trend on my own combination, acne-prone skin for a full week to see whether the hype held up.

What Is the Tallow Trend, Exactly?

Beef tallow is fat rendered down from the tissue surrounding a cow’s organs, according to Corey L. Hartman, a board-certified dermatologist in Birmingham, Alabama. On TikTok, the hashtag has amassed tens of thousands of posts, many promoting small-batch tallow balms sold through TikTok Shop, with some creators framing the ingredient as a dermatologist-hidden secret. A smaller contingent shows followers how to render tallow at home, though experts warn that improper sourcing or storage can invite bacterial growth.

My Week of Tallow, Day by Day

For seven days, I applied a two-ingredient tallow-and-jojoba-oil balm morning and night, skipping makeup and my usual product lineup except for cleanser and sunscreen.

The first day brought no odor, which was a relief, but also a heavy, greasy film that never fully absorbed. By day two, I’d developed three new blemishes and noticed my skin felt paradoxically dry underneath all that grease — likely because the balm offered occlusion without any actual hydrating ingredients. Day three added whiteheads and milia to the mix, and by day four, cystic breakouts had spread to my jawline and forehead, areas I rarely have trouble with. That’s when I caved and layered a hyaluronic acid serum and my regular moisturizer underneath the tallow, plus ran a humidifier overnight.

The adjustment helped. Day five felt calmer, though the visible breakouts remained. On day six, I dropped the extra products to test tallow alone again — my skin protested immediately. By day seven, only one new pimple had surfaced, and I finally tested makeup over the balm: it applied smoothly at first but separated well before the day was done.

Where Tallow Might Actually Help

Dermatologists agree the ingredient isn’t baseless — to a point. Tallow is genuinely occlusive and can support the skin barrier while locking in moisture, Hartman notes. It’s rich in fatty acids like oleic, linoleic, palmitic, stearic and myristic acid, says Omer Ibrahim, a board-certified dermatologist in Chicago, who adds that those properties may benefit people with dry skin. Still, he’s quick to note that a well-formulated, sterile moisturizer can accomplish the same thing without the variability of an animal byproduct. Claims that tallow functions like retinol are also overstated; while it does contain trace vitamin A, the amount is inconsistent and far too small to rival an actual retinoid.

The Case Against Tallow

For anyone with oily or acne-prone skin, tallow may do more harm than good. Its comedogenic nature means it can clog pores, Hartman explains, making it a poor match for breakout-prone complexions. Ibrahim adds that sourcing is a real concern, since improperly stored tallow can harbor bacteria, and some early research suggests it may increase skin sensitivity to sunlight, though more study is needed.

So, Is Tallow Worth the Hype?

My skin didn’t get the memo about tallow’s supposed miracle status — breakouts multiplied, and dryness crept in underneath the grease. Ibrahim points out that plant-based alternatives like coconut oil, shea butter, and jojoba oil offer similar emollient benefits with far more research behind them. Hartman agrees dry-skinned users might see some upside, but stresses that anyone with sensitive, oily, or acne-prone skin — or a condition like eczema or psoriasis — should consult a dermatologist before trying it.

The verdict: tallow isn’t a scam, but it’s also not the skincare revolution TikTok promises. Your mileage, quite literally, may vary.

Source: Prevention