Adding Actives and Addressing Formula Issues in Hybrid Sunscreen

It's great that you're experimenting with the hybrid sunscreen formula! Let's address your questions about adding active ingredients and the issues you encountered with your second formulation attempt.

Adding Arbutin and PepColl

You asked if you can add active ingredients like Arbutin and PepColl to a hybrid sunscreen formula, considering the concern about penetration enhancers with chemical sunscreens.

The concern about penetration enhancers driving chemical sunscreens into the skin is valid, and it's generally recommended to avoid using dedicated penetration enhancers in formulas containing chemical sunscreens for maximum safety.

However, active ingredients like Arbutin and PepColl are designed to be absorbed to some extent to be effective. While a dedicated penetration enhancer would increase their absorption, these ingredients do have some inherent ability to penetrate the skin on their own. Therefore, you can include Arbutin and PepColl in your hybrid sunscreen formula, but avoid adding separate penetration enhancers like PE-1 Aqua.

Addressing the Yellowish Tint and Sedimentation

You experienced sedimentation and liquefaction in your second formula attempt using Nature Preserve, and after switching to Phenoxyethanol SA (Optiphen Plus), the texture improved but the cream had a yellowish tint.

The sedimentation and liquefaction with Nature Preserve were likely due to its incompatibility with your formula, as noted by the staff. Switching to Phenoxyethanol SA (Optiphen Plus) was a good solution for the texture and stability.

Regarding the yellowish color, this can sometimes occur depending on the ingredients used. To make the cream whiter, you can add Titanium Dioxide Nano EasyDisperse™. Adding 1-3% of this ingredient will help whiten the cream and also provide additional sun protection. Be cautious not to add too much, as it can leave a white cast on the skin.

GlucoBright™ Stock

Regarding the availability of GlucoBright™, it is expected to be back in stock around the 10th of this month. We apologize for any inconvenience this delay may cause.

We hope this helps you refine your hybrid sunscreen formulation!