What Is Olive Oil Soap and the Benefits of Using It?

Most articles about olive oil soap tell you the same thing: olive oil is good for your skin, olive oil soap is made from olive oil, so olive oil soap is good for your skin.

It sounds right. It's the reason a lot of people buy it. And it isn't quite true.

The chemistry is stranger and more interesting than that, and once you understand what's actually happening in a bar of soap, you'll be able to walk into any store and tell in about eight seconds whether a bar is worth your money. That's what this is for.

We make eleven olive oil bar soaps by hand in Lake Placid, so we have an obvious stake in you liking olive oil soap. We'd still rather you understood it than believed something flattering about it.

What olive oil soap actually is

Soap is not a mixture. It's a reaction.

You start with a fat — in this case, olive oil. You add a strong alkali, which for bar soap is sodium hydroxide, also called lye. Those two things meet and they don't sit next to each other politely. They convert into something new. The olive oil's triglycerides split apart and reform as fatty acid salts, plus a byproduct called glycerol. We know it better as glycerin.

That reaction is called saponification, and it runs one way only. There's no reversing it, no separating the ingredients back out.

Which means the sentence at the top of this page is worth saying plainly:

There is no olive oil in a finished bar of olive oil soap. It was used up making the soap.

Marcy learned this in a chemistry class in nursing school, which is a strange place to find the beginning of a soap company. She'd spent fifteen years as a massage therapist thinking about scent and skin, and then somebody drew saponification on a whiteboard and it connected to everything she'd learned years earlier about how natural cosmetics are actually built. She started making soap at the kitchen counter. She gave it away. People asked for more. That's the whole origin story, and it starts with this reaction.

The thing almost every olive oil soap page gets wrong

Here's the error, stated clearly, because you will see it on nearly every competitor's page and on plenty of ours before we fixed them.

"Olive oil soap moisturizes because olive oil is moisturizing" is a category error. It treats the finished bar as though it still contained the starting ingredient. It doesn't. You could make the same argument about bread and flour, or an omelet and a raw egg. The input is real. It just isn't what you're holding.

This matters for a practical reason, not a pedantic one. If you buy a bar believing the olive oil is going to sit on your skin and do olive oil things, you're going to be confused by what actually happens — and you'll have no way to tell a genuinely good bar from a bad one, because you're evaluating the wrong thing.

So what is actually good about it?

Quite a lot. It's just not the thing you were told.

The glycerin stays in. Remember that byproduct of the reaction? In small-batch cold-process soap, the glycerin produced during saponification remains in the bar. Large commercial soap manufacturers often extract it, because glycerin is valuable and sells well on its own. Then the bar goes out the door without it. This is one of the few real, chemically defensible differences between a handmade bar and a mass-market one, and almost nobody talks about it because "we didn't remove something" is a hard thing to put on a label.

The surfactant is mild. Different starting fats produce different fatty acid profiles, and those profiles behave differently. Olive oil is high in oleic acid, which produces a notably gentle cleansing salt — it lifts oil and dirt without stripping as aggressively as some alternatives. That's a property of the finished soap molecule, not a leftover of the oil, and it's a legitimate reason to want olive high in the ingredient list.

The ingredient list is short. A true soap contains saponified oils, water, and whatever scent was added. That's it. Most of what's sold as "body bar" or "beauty bar" in a drugstore is a synthetic detergent bar — chemically a different product, often with a long list of additives, and legally not soap at all.

We wrote more about the mechanics of how soap lifts dirt off your skin in How Does Soap Work?, if you want to go further down this road.

A word about "castile"

You'll see "castile soap" used as though it's a certification. It isn't.

"Castile" has no legal definition anywhere. Historically it referred to soap made in the Castile region of Spain from local olive oil. Today, anyone can print it on anything. Some people use it to mean 100 percent olive oil. Some use it to mean any vegetable-oil soap. Some use it because it sounds expensive.

Treat it as a mood, not a spec. The ingredient list is the spec.

Why our bars are not 100 percent olive oil

This is the part where we could quietly say nothing, so we'd rather say it first.

Pure Placid bars are made with saponified olive, coconut, and palm oils, plus water and fragrance. Olive is the base. It is not the only thing in there.

Here's why, and it's not a compromise so much as a design decision:

Olive The base. High in oleic acid, which makes a gentle, low-stripping bar. On its own it's very mild and very slow.

Coconut The lather. Produces the big, fast bubbles people expect from soap. A pure olive bar barely makes any.

Palm The structure. Gives a firm bar that holds its shape and lasts in a wet shower instead of dissolving.

A genuinely 100 percent olive oil bar is a real thing and some people love it. It is also soft, slow to lather, produces a thin creamy foam rather than bubbles, needs a long cure, and will turn to paste if you leave it sitting in water. If we sold you one without telling you that, you'd be disappointed and you wouldn't know why.

So: olive for the gentleness, coconut for the lather, palm for a bar that survives your shower. That's the trade, made on purpose.

What to actually expect from the bar

A few things that surprise people coming from drugstore bars:

• The lather is creamier, not foamier. Handmade soap makes a denser, lower-profile lather. It's cleaning just as well. It just looks different.
• It needs to drain. This is the single biggest thing that determines how long your bar lasts. A bar sitting in a puddle will be gone in a fraction of the time. A slotted dish that lets it dry between uses can easily double its life.
• The scent is strongest in the steam. Heat and water lift the fragrance. You'll smell far more of it in the shower than off the dry bar.
• The bar changes as you use it. Our marbled bars reveal new pattern as they wear down. One customer wrote that hers "just keeps getting more beautiful." We didn't plan that; we just like it.

How long should a bar last?

This is the question we get most, and the honest answer is that it depends almost entirely on you rather than on the soap.

A bar used daily by one person in the shower generally runs four to six weeks. The same bar at a bathroom sink, used for handwashing, can go two or three months. The same bar left sitting in a pool of water on a flat dish can be gone in under two weeks, and that is the difference that catches people out.

Handmade soap holds more water than a mass-produced bar, which is part of why it feels the way it does. It also means it wants to dry out between uses. Three things extend a bar's life more than anything else:

• Give it drainage. A slotted or ridged dish, or anything that keeps the bar up out of the water. This one change does more than the other two combined.
• Keep it out of the direct spray. A bar sitting where the shower hits it is being slowly washed down the drain between uses.
• Let a new bar wait. If you buy two, leave the second one unwrapped in a drawer or a linen closet. It will harden further as it continues to dry, last longer when you get to it, and quietly scent the space in the meantime.

That last one is a genuine trick rather than a sales line. A bar left to sit for a month before use is measurably firmer, and firmer bars last longer.

Bar or liquid?

We make both, so we have no stake in talking you into one.

A bar is a better cleanser by most measures. It's a simpler formula, it needs no preservative system, and it comes with no plastic bottle. The trade is that it needs somewhere to drain and it isn't as easy to share at a busy kitchen sink.

Our liquid hand soaps are made with goat's milk rather than an olive oil base, which is a different product with a different feel. It's the one people reach for at the kitchen sink because it pumps, and because there's nothing to set down while your hands are full. Plenty of our customers keep the liquid at the kitchen sink and a bar in every bathroom, which is more or less how we do it too.

Can you use it on your face?

An honest answer, because the usual answer is a marketing answer.

Plenty of people do, happily. Some don't get along with it, and here's the real reason: all true soap is alkaline, sitting somewhere around pH 9 to 10. Your skin's surface sits lower, closer to 5. That difference is temporary and your skin re-regulates, but if your face is reactive or you're using other products that depend on a low pH, a soap bar may not be your best move.

You'll see claims that olive oil soap is good for acne or psoriasis, or that it's anti-aging because of antioxidants. We're not going to make those claims, and you should be skeptical when anyone does. The antioxidants in olive oil don't survive saponification, and a soap that treats a skin condition isn't legally a soap anymore — it's a drug, with everything that entails. Soap is soap. It's very good at being soap.

Try a bar on your face if you like. Notice what happens. That's more useful than anything we could promise you.

How to read a soap label in eight seconds

1. Look for "saponified" or "sodium [oil]ate." Sodium olivate is saponified olive oil. Sodium cocoate is coconut. If you see these, you're holding real soap.
2. Check what comes first. Ingredients run in descending order. If olive is third behind two other oils, "olive oil soap" is a stretch.
3. Look for detergent names. Sodium lauryl sulfate, sodium laureth sulfate, cocamidopropyl betaine. Not soap. Not bad for you necessarily, but a different product sold under soap's reputation.
4. Be suspicious of a long list. Real soap needs very few ingredients. A label with fifteen lines is telling you something.
5. Ignore "castile," "artisan," and "natural." None of them mean anything enforceable.

The eleven bars, by how you want to feel

All of ours are made the same way — the same olive base, hand-cut, wrapped here. What changes is the scent, and we organize those by the feeling they're built for rather than by the note list.

Reset — bright, clear, awake For the morning shower, or the middle of an afternoon that got away from you. Mount Marcy — mandarin, basil, sandalwood Balsam and Clementine — balsam, clementine, lavender Lemon and Vanilla — Meyer lemon, vanilla, lemongrass Summer by the Lake — lilac, freesia, pomelo

Comfort — warm, soft, unhurried For the long shower at the end of a long day, when you'd like the day to let go of you. Cashmere Sweater — vanilla bean, jasmine, ginger, sandalwood Cozy Flannel — cedar, saffron, ambergris Golden Hour — toasted almond, pistachio, heliotrope, vanilla

Grounded — steady, quiet, rooted For the mornings you need to feel solid before you walk out the door. Adirondack Chair — pine needle, peach, cedarwood, cinnamon Balsam and Cedar — balsam, cedar, eucalyptus White Birch — birch, tonka bean, geranium, vetiver Lakeside Lodge — balsam fir, cedarwood, white birch

If you'd rather choose by feeling than by scent, Shop by Feeling lays out all three families across every product we make.

And if you're buying for someone else, the bars are the easiest thing we sell to give. They don't require knowing anyone's size, shade, or skin type. They get used. Summer by the Lake is the one that leaves the store most often as a gift, usually bought by somebody who wants to hand a person a Lake Placid afternoon in the middle of February.

Frequently asked questions

Is there actually any olive oil left in the bar? No. Saponification converts the oil into fatty-acid salts and glycerin, and the reaction runs one way only. What you get from olive oil is the character of the soap it becomes — a mild, low-stripping surfactant — not the oil sitting on your skin afterward. Is olive oil soap good for your skin? It is a gentle way to get clean. Olive oil is high in oleic acid, which produces a mild cleansing salt that lifts dirt without stripping as hard as some alternatives, and cold-process soap keeps the glycerin that large manufacturers usually extract. It cleans well and rinses clean. What is the difference between olive oil soap and Castile soap? Mostly marketing. “Castile” has no legal definition anywhere. It once meant soap made in the Castile region of Spain from local olive oil; today anyone can print it on anything. Some use it for 100 percent olive, some for any vegetable-oil soap. Read the ingredient list instead. Is olive oil soap suitable for all skin types? Most people get along with it well. Worth knowing that all true soap is alkaline, around pH 9 to 10, while your skin sits closer to 5. Your skin re-regulates on its own, but if yours is reactive, try a bar on a small area before committing to it everywhere. How does it compare to a supermarket bar? Most supermarket bars are synthetic detergent bars rather than soap, which is why many are labelled “beauty bar” or “cleansing bar.” They are not inherently bad, but they are a different product with a longer ingredient list, and the glycerin has usually been removed. Is olive oil soap safe for babies? Ours are scented, and fragrance-free is the usual recommendation for infant skin, so we would not point you at these for a newborn. That is a question for your pediatrician rather than for us — they know the skin in question and we do not. How should I store a bar so it lasts? Give it drainage and keep it out of the direct shower spray. A slotted dish that lets the bar dry between uses does more for its lifespan than anything else. A spare bar left unwrapped in a drawer hardens further and lasts longer when you get to it. How often can I use it? As often as you like. It is soap. If your skin feels tight afterward, that is usually a sign the water is too hot or you are washing more than you need to, rather than a problem with the bar.

One last thing

Bar soap is the least glamorous thing we make. It's also the thing people reorder most reliably, and the thing that gets given away most often, because a bar of good soap is a gift that asks nothing of the person receiving it.

We make ours in small batches here in Lake Placid, from a short list of ingredients we're happy to print in full. Olive, coconut, palm, water, fragrance. That's the whole thing.

Eleven scents. One honest ingredient list. → Shop the bar soaps