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.