How much essential oil to add to soap?
n cold process soap the usage rate is 0.5 oz (14g) of essential oil per pound of oils. Beware that some essential oils can be skin irritants and need to be used more sparingly. These include bitter almond, cassia, cinnamon bark and leaf, benzoin, peru balsam, ylang ylang and some citrus essential oils. Always do your own research on essential oil safety before adding to soap.