To create a Reef-Safe Body Oil with SPF 50 PA+++ that is non-yellowing and compatible with an oil base, the best approach is to use Physical Sunscreen Dispersions. These are mineral-based, do not contain the chemicals banned by reef-protection regulations (such as Oxybenzone or Octinoxate), and do not cause the yellow staining often associated with certain chemical filters like Avobenzone.

Recommended Sunscreen Ingredients

1. Zinc Oxide Transparent Dispersion (C12-15 alkyl benzoate Base): This is a liquid dispersion of Zinc Oxide designed to be transparent on the skin. It provides excellent UVA protection (PA+++) and is reef-safe.
2. Titanium Dioxide 15nm Liquid (Gloss): This is a liquid dispersion of Titanium Dioxide that helps boost the SPF value to reach SPF 50 without leaving a heavy white cast.

Mixing Ratio for 100 ml of Body Oil

To achieve high protection (SPF 50 PA+++), you should use approximately 25% of the sunscreen concentrate in your total formula.

Formula for 100 ml:

• Your Body Oil Base: 75 ml (or 75g)
• Zinc Oxide Transparent Dispersion (C12-15 alkyl benzoate Base): 20 ml (or 20g)
• Titanium Dioxide 15nm Liquid (Gloss): 5 ml (or 5g)

Mixing Instructions:

1. Prepare your 100 ml container.
2. Add the Zinc Oxide Transparent Dispersion and Titanium Dioxide 15nm Liquid into your Body Oil.
3. Shake or stir thoroughly until the mixture is homogeneous. Since these are oil-based dispersions, they will blend easily with other oils.
4. Note: Because these are physical sunscreens, you should shake the bottle well before each use to ensure the active ingredients are evenly distributed.

Why this combination?

• Reef-Safe: It avoids all 4 chemicals banned in Thai National Parks (Oxybenzone, Octinoxate, 4-MBC, and Butylparaben).
• Non-Yellowing: Physical filters do not react with minerals or sweat to turn yellow, unlike some chemical filters.
• Oil-Compatible: These specific versions are already dispersed in oil, making them perfect for a Body Oil product.