Physical Sunscreen Formulation: Increasing SPF and Adding Hyaluronic Acid

Regarding your questions about formulating a physical sunscreen:

1. Increasing SPF with TiO2 and ZnO:
   To increase the SPF of a physical sunscreen, you generally need to increase the total concentration of the UV filters, which are Titanium Dioxide (TiO2) and Zinc Oxide (ZnO).

   • Increasing the proportion of Zinc Oxide 200nm EasyDisperse™ (Product ID 248) and Titanium Dioxide (such as Titanium Dioxide 15nm Liquid, Product ID 724, or Titanium Dioxide nano, Product ID 236) in your formula will help increase the SPF and broad-spectrum protection (UVA/UVB).
   • Zinc Oxide (Product ID 248) provides better UVA protection compared to Titanium Dioxide.
   • Titanium Dioxide 15nm Liquid (Product ID 724) is generally recommended for sunscreens where minimal whitening is desired.
   • Titanium Dioxide 200nm EasyDisperse™ (Product ID 236) is more suitable for formulations like whitening creams, although it also provides UV protection. If you don't want a whitening effect, Titanium Dioxide 15nm Liquid is a better choice.
   • For example formulations, it is recommended to refer to the details provided on the product pages, such as the page for Titanium Dioxide 15nm Liquid (Product ID 724).

2. Including Hyaluronic Acid in Physical Sunscreen:
   You can include Hyaluronic Acid (Standard Molecule, Product ID 404 or 79, and Nano Molecule) in your physical sunscreen formula.

   • The recommended total usage rate for Hyaluronic Acid (combining both Standard and Nano types) in cosmetics is 0.1-0.5%.
   • Specific recommended concentrations based on skin type are:
     • Very dry skin: 0.3-0.5%
     • Dry skin: 0.1-0.3%
     • Normal or dehydrated skin: 0.05-0.1%
   • You should incorporate Hyaluronic Acid within these recommended percentage ranges based on the desired hydration level for your target skin type.