Best Carrier Oils for Cold Process Soap Making (2026 Guide)
Introduction to Carrier Oils in Soap Making
Choosing the right carrier oils is one of the most important decisions you will make as a soap maker. The oils you choose determine the hardness, lather quality, conditioning properties, and shelf life of your finished bars.
In this guide, we will walk through the most popular carrier oils for cold process soap making, with their SAP values, recommended usage rates, and the unique properties each brings to your formulas.
Understanding SAP Values
Before diving into specific oils, it is essential to understand SAP values. The Saponification Value (SAP value) tells you exactly how much lye (sodium hydroxide for bars, potassium hydroxide for liquid soap) is needed to convert a given oil into soap.
Every oil has a unique fatty acid composition, which gives it a unique SAP value. Using the wrong SAP value can result in a soap that is either lye-heavy (caustic and skin-irritating) or oil-heavy (soft, greasy, and more prone to rancidity).
Top Carrier Oils for Soap Making
1. Black Seed Oil (Nigella Sativa)
Black Seed Oil is one of the most prized oils for artisan soap making. With a NaOH SAP value of 0.1387, it can be used at 5-15% of your total oil weight. It adds a distinctive warm amber color, earthy scent, and excellent conditioning properties to the finished bar.
2. Laurel Berry Oil
The defining ingredient of authentic Aleppo soap, Laurel Berry Oil can be used at 15-55% in traditional Aleppo formulas. Its NaOH SAP value is 0.1360. The higher the Laurel Berry Oil percentage, the firmer and more cleansing the bar becomes.
3. Sweet Almond Oil
A versatile, gentle oil that can be used at up to 72% of your oil weight. Sweet Almond Oil creates a wonderfully conditioning bar with a creamy, stable lather. It is particularly popular in baby soaps and sensitive skin formulations.
Conclusion
The best soap formula uses a balanced combination of oils. Typically, 50-65% hard oils (coconut, palm, lard) provide hardness and lather, while 35-50% liquid oils (olive, almond, black seed) provide conditioning and skin feel.
Use our free SAP Calculator to create your perfect formula with exact lye calculations.
Quick Reference: Carrier Oils for Cold Process Soap
Use this table as a starting reference when planning your cold process soap formula. SAP values shown are for NaOH (sodium hydroxide). Always verify with your batch COA and a lye calculator.
| Oil | Main role in soap | Typical usage % | SAP value (NaOH) |
|---|---|---|---|
| Olive Oil | Conditioning, moisturizing base | 40–80% | 0.134 |
| Coconut Oil | Lather, hardness, cleansing | 20–35% | 0.190 |
| Palm Oil | Hardness, stable lather | 15–35% | 0.141 |
| Castor Oil | Lather boost, conditioning | 5–10% | 0.128 |
| Shea Butter | Creaminess, conditioning | 5–15% | 0.128 |
| Black Seed Oil | Superfat, skin conditioning, scent | 5–15% | 0.133 |
| Laurel Berry Oil ★ | Cleansing, hardness, Aleppo soap base | 5–40% | 0.141 |
★ Laurel Berry Oil (Laurus Nobilis Fruit Oil) is the defining ingredient in traditional Aleppo-style soap. When combined with olive oil at 15–40%, it produces the distinctive character that distinguishes Aleppo soap from standard olive oil bars.
Laurel Berry Oil: The Specialty Oil for Aleppo-Style Soap
If you produce Aleppo-style or Mediterranean-inspired soap, laurel berry oil is the single most important specialty oil in your formula. Extracted from the berries of Laurus nobilis using a traditional hot-press water-extraction method, it is a dark green saponifiable carrier oil with a characteristic herbal aroma.
Laurel berry oil contains a significant percentage of lauric acid (35–45%), contributing to soap hardness and lather quality — similar in some ways to coconut oil, but with a gentler cleansing profile and a rich, earthy scent that cannot be replicated with other oils.
SAP value (NaOH): 0.141 | SAP value (KOH): 0.198. Use these figures in your lye calculator when building Aleppo-style formulas.
Looking for soap-making oils from a US supplier?
We supply laurel berry oil, black seed oil, and carrier oils for cold process soap makers — with COA documentation, USA warehouse stock, and wholesale pricing available.
Sekiya Oil Store
Sekiya Sourcing — Manufacturer-Backed Natural Ingredients
For Soap Makers
Source Laurel Berry Oil from the US
Water-extracted Turkish laurel berry oil ships from Norcross, GA. COA & SDS available. No import delays — domestic stock ready for your next batch.
