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20% Zinc Oxide for SPF 50?
Check this formula by Mustela: it’s an anhydrous stick balm composed solely of natural oils, waxes, and extracts and—nothing more!
Interestingly, there are no dispersing agents or SPF-boosting ingredients included. As per Mustela’s website, the only sunscreen agent present is non-nano Zinc Oxide, I assume the uncoated form.
Given this formula, can we assume that 20% zinc oxide in any oil base ensures SPF 50, or at least SPF 30+? While a proper lab test is necessary to determine the SPF accurately, I’m curious if it’s feasible to achieve sufficient UVA/UVB protection that effortlessly.
This caught my attention as I was considering creating an anhydrous SPF balm suitable for acne and fungal acne. I plan to substitute the lipids in this formula with Capric/Caprylic triglycerides, squalane, and rice bran wax (possibly Microcrystalline wax, as it’s safer for fungal acne). What are your thoughts?
- This discussion was modified 2 weeks, 5 days ago by Onur.
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Mustela SPF 50 Mineral Sunscreen Stick ingredients (Explained)
Mustela SPF 50 Mineral Sunscreen Stick ingredients explained: Zinc Oxide (19.7%), Oryza Sativa (Rice) Bran Oil*, Persea Gratissima (Avocado) Oil, Euphorbia Cerifera (Candelilla) Wax, Octyldodecyl Olivate, Simmondsia Chinensis (Jojoba) Seed Oil, Beeswax, Theobroma Cacao (Cocoa) Seed Butter, Oryzanol, Butyrospermum Parkii … Continue reading
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