Sunscreen Lotion Formulation: Improving Stability and Texture

Thank you for providing the formula and the staff's feedback. I can review the formula for you.

The original formula you provided is:

Sun Screen Lotion SPF49++++

(Oil-phase)

• Zinc Oxide 25%
• Cyclomethicone 25%
• Milk Lotion Maker 5%

(Water-phase)

• Water 36%
• Vitamin B3 4%
• N-Acetyl-D glucosamine 4%
• Phenoxyethanol SA 1%

Total: 100%

You mentioned this is for body lotion for very dry and damaged skin.

The staff's feedback is that the original formula might be too liquid and the Zinc Oxide powder could settle. They recommend adding Satin Cream Maker or Light Cream Maker at 1% to improve the consistency and prevent settling.

The staff provided a revised formula:

(Oil-phase)

• Zinc Oxide 22%
• Cyclomethicone 22%
• Milk Lotion Maker 5%

(Water-phase)

• Water 41%
• Vitamin B3 4%
• N-Acetyl-D glucosamine 4%
• Phenoxyethanol SA 1%
• Satin Cream Maker 1%

Total: 96% (Note: The percentages in the revised formula provided by the staff add up to 96%. Assuming the intention was to adjust the water phase to reach 100%, the water percentage should be 45% instead of 41%. However, I will present the formula exactly as provided by the staff.)

The staff's suggestion to add a thickener/stabilizer like Satin Cream Maker is appropriate. With a high concentration of a solid powder like Zinc Oxide (25% or 22%), increasing the viscosity of the lotion helps to keep the powder suspended evenly throughout the product, preventing it from settling over time. This improves the stability and appearance of the sunscreen.

The other ingredients like Vitamin B3 and N-Acetyl-D glucosamine are beneficial for skin, aligning with your goal for dry and damaged skin.

The revised formula incorporating Satin Cream Maker addresses the potential stability issue related to the high Zinc Oxide content.