Historically, castile soap was limited to 100% olive oil, water, and lye.
The Complete Guide to Pure Castile Soap: History, Science, and Essential Buying Practices buy pure castile soap
Castile soap’s roots trace back to the Aleppo region of Syria, where soapmakers used olive and laurel oils. After the Crusades, the recipe migrated to Spain, where an abundance of olive groves led to the creation of the pure olive oil formula. Historically, castile soap was limited to 100% olive
Pure castile soap is a versatile, plant-based cleanser celebrated for its historical prestige and modern ecological benefits. Originally made from 100% olive oil in the Castile region of Spain, this "true soap" has evolved into a multi-functional tool for personal care and household maintenance. I. Historical Evolution and Composition the recipe migrated to Spain