Body Sunscreen Formulation SPF50 PA++++ (No White Cast)

To formulate a body sunscreen with SPF50 PA++++ that does not leave a white cast, chemical UV filters are typically used instead of physical filters like Zinc Oxide or Titanium Dioxide, which can cause a white residue, especially at high concentrations.

Achieving high SPF and PA values usually requires a combination of different chemical filters that cover both UVA and UVB spectrums.

Here are some types of UV filters commonly used to achieve high protection without a white cast:

• Avobenzone (Butyl Methoxydibenzoylmethane): This is a highly effective filter for UVA rays (responsible for aging). It is oil-soluble and needs to be dissolved in an appropriate solvent. It is important to note that Avobenzone can be unstable when exposed to UV light and should not be used with Zinc Oxide, Titanium Dioxide, or Octyl Methoxycinnamate. It often requires stabilization with other ingredients like Octocrylene or through specific technologies.
• Bisoctrizole (equivalent to Tinosorb M): This is a broad-spectrum filter providing protection against both UVA and UVB rays. It is water-dispersible, making it easy to incorporate into various formulations, and is known for its good compatibility with other UV filters.
• AquaForce™ AVO (Avobenzone/BEMT Water-Dispersion): This is a convenient water dispersion product containing Avobenzone and BEMT (equivalent to Tinosorb S). BEMT is another broad-spectrum filter. This combination provides excellent and stable UVA protection and is ideal for creating lightweight, water-based sunscreen formulas.

By carefully selecting and combining these and other compatible chemical UV filters, you can develop a body sunscreen formulation that provides high SPF50 PA++++ protection with a light texture and no white cast.