As a natural antioxidant and preservative, Rosemary Extract can prolong the life of bar soap and other skin-care products by helping to prevent oxidation. Its color can potentially darken bar colors if added in higher quantities, and it carries its own slight aroma which should not show through in final products.
Attention Soap Makers! The saponification process does not affect Rosemary Extract's preservative properties.
Rosemary Extract is soluble in fats and vegetable oils. If sealed and stored properly (cold, dark place), Rosemary Extract can have a shelf life of 18 to 24 months.
Suggested Usage Rate: A suggested usage rate of Rosemary Extract in soap recipes is from 0.03% up to 0.10%. The suggested usage rates are intended to be used as guidelines.