Most soap labels list a dozen or more ingredients — some familiar, most not. Aleppo soap is the opposite. Made the same way for over a thousand years in Aleppo, Syria, it has exactly four ingredients, and every bar we sell lists them plainly.
That simplicity is the whole point, but it also raises real questions: does the finished bar still contain lye? What does the laurel oil percentage actually change? And if there's no preservative, how does it not spoil? Here's what's actually in the bar, ingredient by ingredient.
Aleppo soap has just 4 ingredients: olive oil, laurel berry oil, water, and sodium hydroxide (lye) — and the lye fully reacts during saponification, so none remains in the finished bar.
The laurel oil percentage (1%–40%) is the only variable between bars. Higher percentages mean a stronger scent and a firmer, more concentrated bar — not a different ingredient list.
There's no added preservative because true soap's naturally alkaline pH (around 9–10) is inhospitable to the bacteria and mold that preservatives are formulated to stop.
What's missing matters as much as what's in it: no palm oil, no sulfates, no parabens, and no synthetic fragrance — a genuinely short list by any cosmetic-aisle standard.
What Are the Actual Ingredients in Aleppo Soap?
Four: olive oil, laurel berry oil (oil pressed from the fruit of the Laurus nobilis tree), water, and sodium hydroxide. That's the complete list on every bar we carry, regardless of laurel percentage. There's no filler, no synthetic binder, and no fragrance oil added on top — the scent you smell is the laurel oil itself.
Olive oil makes up the bulk of the bar (typically 60–99% depending on the laurel concentration) and is what saponifies into the actual cleansing soap. Laurel berry oil is the differentiator — it's what separates Aleppo soap from a plain olive oil (Castile) bar, and it's responsible for the bar's characteristic green-to-brown color and earthy scent.
Does the Finished Bar Still Contain Lye?
No. Sodium hydroxide (lye) is a required ingredient in the manufacturing process, but it doesn't survive that process as lye — it reacts completely with the oils in a chemical reaction called saponification, becoming soap and glycerin. When a cold- or hot-process soap is formulated correctly, true soap is legally defined by regulators as the alkali salt of a fatty acid — meaning the lye is chemically consumed, not present as a leftover raw ingredient.
Aleppo soap's long cave-curing period (9+ months for the bars we carry) is part of what makes this reliable: the extended cure time gives any trace of unreacted lye time to finish reacting, which is also why fresh, uncured soap can feel harsher on skin than a properly aged bar.
What Does the Laurel Oil Percentage Actually Change?
It changes concentration and scent strength, not the ingredient list. Every Aleppo soap bar has the same four ingredients — what changes between a 1% bar and a 40% bar is simply how much of the olive oil base is swapped for laurel berry oil.
- Lower percentages (1%–5%): mild, mostly olive-oil-forward scent, gentler for daily face and body use.
- Mid-range (12%–25%): a noticeably stronger, greener scent and a firmer bar — the traditional middle ground.
- Higher percentages (40%+): the most concentrated laurel oil content, a pronounced earthy aroma, and historically the grade reserved for hair and scalp use in Aleppo itself.
Laurel oil has a long folk reputation for skin- and scalp-friendly properties, but it's worth being precise about the evidence: the strongest published safety data on Laurus nobilis comes from a 2025 study testing a laurel hydrosol (a water-based distillate, not the pressed oil used in soap) on skin cells and microbes, which found it non-cytotoxic with only "weak antimicrobial activity" — a modest finding, not a clinical claim, and for a different preparation than what's in the bar.
Why Doesn't It Need a Preservative?
Because true soap's own chemistry does the job. Cold-process soap like Aleppo soap sits at a naturally alkaline pH — generally in the 9–10 range — and that environment is hostile to the bacteria and fungi that spoil neutral-pH products. A recent comparative study of commercial bar and liquid soaps found this pH difference is the actual mechanism: alkaline bar soaps showed measurably different antimicrobial behavior than neutral-pH liquid formulations, which is why traditional bar soap has never needed the preservative systems that liquid soaps and lotions require.
This is also why a bar this simple can carry Cosmébio certification — the French organic-cosmetics label that requires a minimum of natural-origin ingredients and prohibits synthetic preservatives, among other criteria. A four-ingredient bar with no added preservative is a straightforward fit for that standard, not a marketing stretch.
What's NOT in Aleppo Soap?
No palm oil, no sulfates (SLS/SLES), no parabens, no synthetic fragrance, and no synthetic dye. That's a deliberate contrast with most commercial bar and liquid soap, which typically list a detergent base plus a preservative system plus a fragrance blend on top of it.
The palm-oil-free point matters beyond ingredient purity — Aleppo soap's olive-oil base was never built around palm oil in the first place, so switching to it doesn't require substituting one problematic oil for another the way some "natural" soap reformulations do.
How Is Aleppo Soap Actually Made?
By hand, over roughly a year, in five stages: the oils and lye are cooked together, poured to set, cut, stamped, and cave-cured for months. Here's the traditional process, unchanged for centuries:
- Combine and cook: Olive oil and laurel berry oil are combined with water and lye in a large cauldron and heated slowly, stirred by hand for hours until the mixture saponifies.
- Pour to set: The hot soap is poured onto a large flat surface and left to cool and harden into a single sheet.
- Cut into bars: Once firm enough, the sheet is scored and cut into individual blocks by hand.
- Stamp: Each bar is hand-stamped, traditionally with the maker's mark.
- Cave-cure: The bars are stacked and cured in a cool, dry space for 9+ months (the spec for the bars we carry), during which any remaining moisture evaporates, the bar hardens, and the saponification reaction fully completes.
That last step is the one most commercial soap skips — mass-produced bars are often cured for days, not months, which is part of why an authentically cured Aleppo bar feels and lasts differently than a supermarket equivalent.
Shop the Bar
Traditional Aleppo Soap
4 ingredients, cave-aged 9+ months in Aleppo, Syria. Vegan, palm-oil-free, and Cosmébio certified — available from 1% to 40%+ laurel oil.
Shop now → ✓ 30-day money-back guarantee · Free shipping over $75Frequently Asked Questions
How many ingredients does Aleppo soap actually have?
Four: olive oil, laurel berry oil, water, and sodium hydroxide (lye). The lye is fully consumed during saponification and isn't present in the finished bar.
Is Aleppo soap vegan?
Yes. It's made entirely from plant oils with no animal fats, tallow, or beeswax.
Does Aleppo soap contain palm oil?
No. Its base oil is olive oil, not palm oil, and it's explicitly formulated palm-oil-free.
What does "Cosmébio certified" actually mean?
Cosmébio is a French organic-cosmetics label requiring a high proportion of natural-origin ingredients and prohibiting synthetic preservatives, irradiation, and petrochemical solvents. It's verified by independent certifiers, not self-declared.
Why do higher laurel-oil bars cost more and smell stronger?
Laurel berry oil is more expensive and labor-intensive to produce than olive oil, so a 40% bar uses proportionally more of the costlier ingredient — which is also why the scent gets noticeably stronger and greener at higher percentages.