Rancidity of Natural Oils and Waxes

Based on the ingredients provided, the most likely culprits for the rancid smell are the natural oils and butter: Avocado Oil, Shea Butter, and Jojoba Oil. Carnauba Wax is less likely but still possible.

Natural oils and fats contain fatty acids which can undergo oxidation, leading to the characteristic smell of rancidity. The heating process during preparation can sometimes accelerate this oxidation if the oils are exposed to air.

As suggested by the staff, Avocado Oil is often the most prone to rancidity among the oils listed.

To address this issue, you can try the following:

• Test by removing Avocado Oil: See if the rancid smell still develops without it.
• Proper Storage: Store the finished product in a cool, dark place in an airtight container to minimize exposure to heat, light, and air.
• Consider Antioxidants: Adding an appropriate antioxidant to your formulation can help slow down the oxidation process in the oils.