Tallow soap and tallow balm do opposite jobs. Soap takes oil off your skin. Balm puts it back. They're both made from the same fat, but by the time a bar exists, the tallow inside it isn't tallow anymore: it's been chemically converted into soap. That one fact answers most of what people ask about bars.
A good tallow bar is a fine thing to wash with, and I'd rather you used one than a foaming gel that leaves your face squeaking. It just isn't a moisturizer, whatever the label says, and it isn't a substitute for the step that comes after it.
We don't make soap. We pour balm, and the one that goes on after your bar is Bare Silk Unscented ($34), a pea on damp skin. Here's the chemistry behind why those are two different products.
What tallow soap actually is
Soap is a chemical reaction, not a blend. You combine a fat with a strong alkali (sodium hydroxide for bars, potassium hydroxide for liquid soap) and the alkali splits the fat's triglycerides apart. What you're left with is the sodium salts of those fatty acids, which is the soap, plus glycerin, which is a byproduct of the reaction. That reaction is called saponification, and once it's done, the tallow is gone as tallow.
So when a bar says "made with grass-fed tallow," it's telling you the truth about the input, not about what's touching your skin. What's touching your skin is sodium tallowate, sodium stearate, sodium oleate and their siblings. Those are surfactants: molecules with a water-loving end and an oil-loving end, which is exactly why they lift oil off you and rinse it down the drain.
Two things make a tallow bar feel better than a cheap one, and neither is intact tallow. The first is superfat: soapmakers deliberately use a little more fat than the lye can convert, usually 5 to 8%, so a small fraction of unsaponified oil stays in the bar and lands on your skin as you wash. The second is glycerin, a humectant that the reaction makes for free. Commercial soap makers often strip glycerin out to sell it separately, which is a large part of why a handmade bar feels different from a supermarket one.
The other thing worth knowing: real soap is alkaline, usually somewhere around pH 9 to 10, while your skin's surface sits closer to 4.5 to 5.5. Skin re-acidifies itself within an hour or two, and for most people that's a non-event. For very reactive or barrier-stressed skin, that hour is the window where things get itchy, which is why synthetic-detergent bars and non-soap cleansers exist at all.
Tallow soap vs tallow balm, side by side
| Tallow soap | Tallow balm | |
|---|---|---|
| What it is chemically | Salts of fatty acids (saponified fat) plus glycerin | Whole fat, unchanged, blended with oils |
| Job | Cleansing: lifts oil and dirt, rinses off | Sealing and feeding: stays on, slows water loss |
| Contact time | Twenty seconds, then down the drain | Hours, overnight if you use it at night |
| pH | Alkaline, roughly 9 to 10 | None to speak of; there's no water in it |
| Does the tallow survive? | Only the superfat, 5 to 8% | All of it |
| Preservative needed | No (alkaline, and dry once it has aged) | No (waterless; antioxidants only) |
| Typical price | $8 to $16 a bar | $20 to $90 a jar |
| Where it fits | First step, in the shower or at the sink | Last step, on damp skin, thirty seconds later |
Does tallow soap moisturize?
No, and this is the claim I'd push back on hardest in the whole category. A cleanser that rinses off cannot moisturize you, because moisturizing means leaving something behind that slows water loss over hours. Soap's entire mechanism is the opposite: it grabs oil and takes it away.
What a good tallow bar can say is that it's less stripping than the alternatives. The superfat leaves a trace of oil behind, the glycerin holds a little water at the surface, and the fatty acid profile is mild compared to a sulfate-based body wash. That's a real difference, and it's why people who switch to a tallow bar often say their skin stops feeling tight. Less stripping is not the same as moisturizing, though, and if a bar is your only step, you're still ending the shower with a barrier that's had oil removed from it.
The fix takes thirty seconds: wash with the bar, pat until you're damp but not wet, then press a balm on while the water is still there. That order is the standing dermatology advice for dry skin, moisturize while skin is still damp and choose an ointment or cream over a lotion. The balm slows the evaporation of the water your shower just added. That two-step is the entire ritual, and it works with anybody's bar, not just a tallow one. Tallow vs traditional moisturizers covers why a waterless seal behaves differently from a lotion.
How to read a tallow soap label
Soap labeling is looser than cosmetics labeling, because in the US a true soap sold as soap sits outside the usual cosmetic rules. So you'll see everything from a full ingredient list to four words and a ribbon. Here's what to look for:
- Superfat, stated. 5 to 8% is the range where a bar feels good without going soft and rancid early. Most good makers will tell you if you ask; the best print it.
- Sodium hydroxide on the list is normal. Some labels list the inputs (tallow, water, sodium hydroxide), some list the outputs (sodium tallowate, glycerin). Both are correct. No lye means no soap.
- Cured four to six weeks. A bar that's been left to dry for a month or more is harder, milder and lasts longer in the dish. Fresh-cut soap is soft and disappears fast.
- No fragrance if your skin is reactive. Fragrance and essential oils are the most common triggers in the whole category, and a bar with no scent at all is the safest place to start.
- Suet or trim, and grass-finished or not. The same sourcing questions apply to a bar as to a jar, even though less of the fat survives. Grass-fed vs grass-finished is the decoder.
- Palm or no palm. Many "tallow" bars are mostly tallow with palm and coconut for hardness and lather. That's a normal recipe, not a cheat, but it changes what you're buying.
Where to find one: tallow soap is a farmers-market and Etsy product far more than a shelf product, same as balm, and the sellers overlap heavily. Where to buy tallow balm maps the channels and the questions worth asking a maker in person; they apply to bars too.
Looking for a tallow soap recipe?
I'm not going to publish one, and I want to be straight about why. Soapmaking is a different craft with a different safety envelope: you're working with sodium hydroxide, which is caustic enough to burn skin and blind an eye, in a reaction that generates heat, and the fat-to-lye ratio has to be calculated for the specific fats you're using or the bar comes out either lye-heavy or greasy. Soapmakers run those numbers through a lye calculator every single batch. That's a craft of its own, and balm is mine.
If you want to learn it, learn it from soapmakers who teach the safety first. What I can hand you is the other half of the craft: how to make tallow balm at home is the real recipe by weight, no lye involved, including the cooling step that keeps a batch from going grainy. And if you want the botanicals measured out for you, the Craft Tallow Kit ($110) ships five tallow bases, five measured vials, a warming plate and a recipe deck; it's sold out right now and ships in about three weeks on pre-order.
A short history of tallow soap
Soap is one of the oldest recorded uses of rendered fat. The standard histories put soap making in Babylon around 2800 BC, on clay cylinders that describe fats boiled with ashes. That's the same fat-plus-alkali reaction a soapmaker runs today. One fat, five thousand years follows the fat itself from those cylinders to the jar.
In the 1800s, American soap became a factory trade that ran on animal fat. The historian Judith Ridner describes one early soap works where laborers boiled down fat from homes and butchers in big cauldrons. The candles and the soap they sold both started there. Fat's hold on soap didn't last. Solid vegetable fats arrived in the early 1900s and made soap less dependent on animal byproducts. Then the fat shortages of both world wars pushed chemists toward synthetic detergents.
Tallow soap's comeback is a small-batch one: bars cured on a rack for weeks and sold from a market table. That's where most tallow bars sell now, which is why the label questions above are worth asking whoever's behind the table.
Why we don't make soap
One job per jar is the rule I run the line on, and soap fails it in a specific way: a bar can't carry the botanicals that make our jars worth their price, because most of what you'd put in gets either destroyed by the lye or rinsed off in twenty seconds. Bakuchiol, rosehip CO2, blue tansy, manuka extract, none of them survive that trip in a useful form or stay on your skin long enough to do anything.
The other reason is more practical. Soapmaking needs its own equipment, its own drying room and its own competence, and one shop running two crafts tends to do both less well. So I'd rather point you at someone who makes a good bar and put my work into the step where a recipe stays on your skin.
Which jar goes on after the bar
Sensitive, reactive, or a whole household sharing one jar: Bare Silk Unscented ($34), five ingredients, no essential oils. Dry, tight skin where lotion never lasts an hour: Honey Glow ($42), manuka honey extract on tallow with oat oil and squalane. Warm, flushed, easily-triggered skin at the end of the day: Moonlight Calm ($69) as the last step of the night. The whole line is in the balm collection, and the quiz at find your balm sorts it in two minutes.
The jar for this job is Bare Silk Unscented ($34). Subscribe to two jars and a third rides free, and every subscription takes 25% off the first delivery.
Questions we hear
Is tallow soap good for eczema-prone skin?
It's often gentler than a sulfate body wash, and an unscented, high-superfat bar is a reasonable choice for washing. But guidance for eczema-prone skin is short contact, lukewarm water, a mild cleanser and an emollient right afterward, the soak and seal habit, and a bar is still a surfactant at an alkaline pH. Use it briefly, rinse well, and put the balm on while you're damp. If you're in a flare, follow your provider's plan.
Can I use tallow soap on my face?
You can, and plenty of people are fine with it, but faces are less forgiving than bodies. If you try it, pick an unscented bar with a stated superfat, keep the contact under thirty seconds, use lukewarm water, and follow immediately with a balm on damp skin. If your face feels tight ten minutes later, the bar is too much for it.
Does tallow soap moisturize?
No. It rinses off, so it can't leave a barrier behind. What a good tallow bar does is strip less than the alternatives, thanks to the superfat and the glycerin. The moisturizing step is whatever you put on afterward.
Is tallow soap good for your skin?
For most people, yes, as a cleanser. It lathers well, it's mild compared to detergent bars, and the ingredient list is short. It's still alkaline, so very reactive skin sometimes does better with a non-soap cleanser. Judge it by how your skin feels twenty minutes after the shower, not by how it feels in it. The step after is a balm pressed onto damp skin, and how to use a tallow balm walks through it.
What are the benefits of beef tallow soap?
Next to a regular supermarket bar, beef tallow soap gives you a creamier lather and a harder bar that lasts longer in the dish. It also comes with a short ingredient list and keeps the glycerin that commercial makers often strip out. If it's made from grass-finished suet, the scent stays mild too. Every one of those is a washing benefit. Saponification turns the fat into soap, so the bar cleans and the balm you press on afterward does the moisturizing.
Do I need both a tallow soap and a tallow balm?
You need a cleanser and a moisturizer. They don't both have to be tallow. If your bar already works, keep it and add the balm; the balm is the step most people are missing, not the soap.
Go deeper
Beef tallow for skin: the complete guide is the long version of what the whole fat does when it stays on your skin. Why there is no water in our balms explains the preservative question a bar answers a different way. Suet, not trim is the sourcing question that applies to bars too, tallow vs traditional moisturizers covers the seal-versus-lotion difference, and how to make tallow balm at home is the recipe I can hand you. Tallow shampoo, body wash and face wash takes the same question to the bottles. Tallow shaving soap and aftershave is the one soap we would point you to, and what goes on after.
Sources
- Chemistry LibreTexts. Saponification of Fats and Oils; Soaps and Detergents. Map: Organic Chemistry (Wade).
- American Academy of Dermatology Association. Dermatologists' top tips for relieving dry skin. AAD.
- National Eczema Association. Bathing and Eczema. National Eczema Association.
- American Cleaning Institute (n.d.). Soaps & Detergents History. American Cleaning Institute.
- Ridner J (2020). The dirty history of soap. The Conversation.
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.