Formula Review and Adjustment Suggestions

The formula you provided is a good starting point, incorporating several beneficial ingredients for skin care such as Niacinamide, N-Acetyl-DGlucosamine, Cucumber extract, Centella Asiatica Extract, and REGU®-AGE. These ingredients are known for their properties like brightening, hydration, soothing, anti-aging, and reducing dark circles.

However, based on the recommended usage rates for the specific ingredients, one adjustment is necessary:

• Centella Asiatica Extract (Madecassoside): The concentration of 5% is higher than the recommended maximum usage rate of 2% for the high-concentration Madecassoside 90% product. It is recommended to reduce the concentration to 1-2% for optimal efficacy and to follow the supplier's guidelines.

Suggested Adjustment:

Reduce the Centella Asiatica Extract (Madecassoside) to 1% (or maximum 2%). This means you will need to increase the Distilled Water percentage to compensate and keep the total formula at 100%.

Revised Formula Example (with Centella Asiatica at 1%):

• Distilled Water: 83.5%
• Vitamin B3, Niacinamide (Safe-B3™): 2%
• N-Acetyl-DGlucosamine: 2%
• Cucumber extract: 5%
• Centella Asiatica Extract (Madecassoside): 1%
• REGU®-AGE: 5%
• Phenoxyethanol: 0.5%
• Xanthan gum: 1%

Additional Considerations:

• pH Level: Ensure the final pH of the formula is within the optimal range for all ingredients, ideally between 5.0 and 6.5, after all components are mixed. You may need to adjust the pH using a suitable acid or base if necessary.
• Mixing Procedure: Ingredients like REGU®-AGE and Centella Asiatica Extract should typically be added in the final step at temperatures below 40°C to preserve their efficacy. Xanthan gum should be properly dispersed in the water phase to form a gel.
• Preservation: Phenoxyethanol at 0.5% provides preservation, but it is highly recommended to perform a challenge test on your final product to ensure its effectiveness against a broad spectrum of microorganisms over time.

By making the adjustment to the Centella Asiatica Extract concentration and considering the pH, mixing procedure, and preservation, your formula should be more balanced and effective.