Mutton tallow is rendered sheep fat, and beef tallow is rendered cattle fat. On skin they do the same basic job, and they part ways on smell and on how fast they go stale. That's most of why we chose beef.
We buy 100% suet, the dense fat from around the kidneys, from grass-fed and grass-finished cattle on Montana family ranches, bought direct. Our plainest jar is Bare Silk ($34). It's suet tallow with four supporting ingredients. Prices here are as of October 5, 2026.
Scars get their own section below, and Recovery Balm ($74) is our jar for the look of scars and stretch marks.
What is mutton tallow?
Mutton tallow is sheep fat melted down and strained, and it's been on skin for a long time. In old American pharmacy it was the official suet. Felter and Lloyd's King's American Dispensatory (1898) defines it as the internal abdominal fat of the sheep, purified by melting and straining. It melts at 45 to 50 C (113 to 122 F). Pharmacists used it as a firm base for ointments, so its reputation as a skin fat is an old one.
I couldn't find a published study that tests mutton tallow on skin. A 2024 scoping review of tallow and skin by Russell and colleagues found mostly lab and animal work, and it doesn't single out sheep fat at all. So the mutton tallow benefits worth counting are the ones any dense fat has: it holds water in and relieves dryness.
Lanolin is a different thing. It's wool wax, the greasy coating washed out of fleece, and a 2023 DermNet page by Whittaker puts it at more than 80% heavy esters. Tallow comes out of the animal. Lanolin comes off the wool, and some people react to it on contact.
How do the two fats compare?
On paper, the two fats are a close match: both are built mostly from the same few fatty acids, the ones our post on the fatty acids in tallow walks through. You'll read that sheep fat runs higher in stearic acid. USDA's record for raw lamb fat trimmed from retail cuts doesn't show it: scaled to the fat alone, it's about 14% stearic acid, against about 19% in USDA's beef tallow. That record covers fat from retail cuts, though, not kidney fat. List and colleagues (2003) measured mutton tallow from three body sites at 52 to 64% saturated fat, with kidney fat the most solid. USDA's beef tallow sits near the bottom of that range. So sheep kidney fat can set harder, and the stearic claim depends on which fat you're holding.
The clearer gap is polyunsaturated fat. Scaled the same way, the lamb record carries about 7.6% against 4% in beef tallow, nearly double. That's the fragile part. A 2019 review by Domínguez and colleagues notes that oxidation climbs steeply with every added double bond, so the sheep fat should go stale sooner in a jar. Sheep fat also smells like sheep. Zhao and colleagues (2022) tie the mutton note in sheep meat and milk mainly to branched-chain fatty acids.
| Trait | Sheep fat | Beef tallow |
|---|---|---|
| Stearic acid, per 100 g of fat | About 14 g (USDA lamb fat) | About 19 g (USDA tallow) |
| Polyunsaturated fat, per 100 g of fat | About 7.6 g (USDA lamb fat) | About 4 g (USDA tallow) |
| Saturated share | 52 to 64% in rendered mutton tallow (List 2003) | About 50% (USDA tallow) |
| Smell | A mutton note from branched-chain fatty acids | Mild when suet is rendered low |
Why did we choose beef?
Mutton tallow isn't a bad fat, and if it suits your nose, it'll do the plain moisturizer job. We chose beef suet for three reasons, and a fourth holds for any tallow. Smell comes first: our suet is nearly scentless, so Bare Silk Unscented smells like nothing and the scented jars smell like the botanical on the label. A sheep base would put its own note under every one of them. Freshness is second. There's no water in any of our recipes, so there's no preservative system. A fat with about half the polyunsaturated share is the safer bet for a jar that has to stay fresh on its own.
Supply is third. We buy kidney suet direct from Montana family ranches, and we know where every jar starts. Last, beef suet's main fatty acids overlap with the ones in skin's own surface lipids, though sheep fat shares that, so it's an argument for tallow more than for beef.
Is mutton tallow good for scars, and which jar fits?
I couldn't find a study that tests mutton tallow on scars, and the 2024 review found little human work on any tallow. Nothing in that record shows a fat changing a scar. A raised or changing scar is a dermatologist's call first. I make the balm I'm about to recommend. It's cosmetic care, not a treatment. Your provider's plan comes first.
What a dense fat can do is relieve the dryness and tightness on the skin around an old, closed mark. Recovery Balm is built for it. It's our jar for the look of scars and stretch marks, with a second job on hands and heels. Its key ingredients are suet tallow, helichrysum, sea buckthorn CO2 and tamanu.
If you've come for a plain tallow, Bare Silk is suet tallow with four supporting ingredients, and the Unscented original has no essential oils or fragrance. For the look of scars, Recovery Balm is the one I'd hand you, on closed skin only.
The jar for this job is Recovery Balm ($74). Subscribe to two jars and a third rides free, and every subscription takes 25% off the first delivery.
Questions we hear
What are the benefits of mutton tallow for skin?
Mutton tallow does what beef tallow does on skin: it's a dense fat that holds water in and relieves dryness and roughness. It was an official ointment base in old American pharmacy. Published skin studies on mutton tallow itself are hard to find, so claims beyond moisturizing have little research behind them.
Does mutton tallow smell?
It usually smells more than beef suet does, with a sharper note that reads as sheep. Zhao and colleagues (2022) tie the mutton note in sheep meat and milk mainly to branched-chain fatty acids, and those ride along in the fat. If you want a jar that smells like nothing, beef suet's the easier start.
Is lanolin the same as mutton tallow?
No. Lanolin is wool wax, the greasy coating washed out of sheep's fleece, and it's mostly heavy esters. Mutton tallow is body fat melted out of the animal. Some people react to lanolin on contact, so check labels for it if you know you do.
Is mutton tallow or beef tallow better for skin?
Neither is clearly better on skin, since both are built from the same main fatty acids and do the same moisturizing job. Beef suet smells milder. USDA's beef tallow also carries about half the polyunsaturated fat of its lamb fat record, so beef should keep better in a jar. That's why we chose it.
Go deeper
Our post on the fatty acids in tallow, in plain English has the full beef numbers we didn't repeat here. For marks, read our guide to marked skin. The beef tallow for skin guide covers what any tallow does on skin, and suet, not trim explains why the cut of fat matters as much as the animal. The pork version of this question is lard vs tallow on skin. For the fats beyond sheep and pork, read bison, buffalo, goat and deer tallow.
Sources
- Zhao Y and colleagues (2022). Effects of Allium mongolicum Regel ethanol extract on three flavor-related rumen branched-chain fatty acids, rumen fermentation and rumen bacteria in lambs. Frontiers in Microbiology 13:978057.
- List GR, Steidley KR, Neff WE and Snowder GD (2003). Physical properties of mutton tallow. Grasas y Aceites, volume 54, issue 2, pages 113 to 115.
- Russell MF and colleagues (2024). Tallow, rendered animal fat, and its biocompatibility with skin: a scoping review. Cureus 16(5):e60981.
- United States Department of Agriculture, Agricultural Research Service (2019). Fat, beef tallow. FoodData Central database, SR Legacy release, FDC ID 171400, USDA.
- Domínguez R and colleagues (2019). A comprehensive review on lipid oxidation in meat and meat products. Antioxidants 8(10):429.
- United States Department of Agriculture, Agricultural Research Service (2019). Lamb, composite of trimmed retail cuts, separable fat, trimmed to 1/4 inch fat, choice, raw. FoodData Central database, SR Legacy release, FDC ID 174309, USDA.
- Felter HW, Lloyd JU (1898). Sevum (USP), suet. King's American Dispensatory, transcribed by Henriette's Herbal Homepage.
- Whittaker L (2023). Contact reactions to lanolin. DermNet, the online dermatology reference first built in New Zealand.
Brian is the founder of Craft Tallow, a small-batch tallow skincare line shipped from Cottonwood Heights, Utah, built on 100% grass-fed suet. Questions? Reply to any email from us; it lands with him.