Formulation Issue: Precipitate in BHA Formula

You've encountered a precipitate in your formula containing encap BHA, Panthenol (B5), Allantoin, Phenoxyethanol, and Water. This is likely due to the limited solubility of some ingredients in water at room temperature, specifically Allantoin and potentially the specific type of encap BHA you are using at 6.6% concentration.

Allantoin has a maximum solubility of about 0.5% in water at 25°C, which is the concentration you are using. While Panthenol and Phenoxyethanol are water-soluble, Salicylic Acid (BHA), depending on its form, can have limited water solubility. Although some encapsulated forms are designed to be water-soluble, achieving a clear solution at higher concentrations like 6.6% might still require assistance.

The staff's recommendation to use slight heat is correct. Increasing the temperature of the water phase will significantly improve the solubility of both Allantoin and help ensure the complete dissolution or dispersion of the encap BHA, preventing precipitation.

Here are the recommended mixing steps to achieve a clear solution:

1. Combine the Water, encap BHA, Panthenol (B5), Allantoin, and Phenoxyethanol in a suitable container.
2. Gently heat the mixture while stirring continuously. Aim for a temperature around 60°C. Do not exceed 60°C.
3. Continue stirring at this temperature until all solid particles (encap BHA and Allantoin) are completely dissolved and the mixture is clear.
4. Remove the mixture from the heat and allow it to cool down to room temperature.

Following these steps should resolve the precipitation issue and result in a clear, stable formula.