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When selecting a supplier, it's essential to consider factors such as their reputation, product quality, certifications, and sustainability practices. A reputable supplier should provide certificates of analysis to guarantee the purity and composition of the product. Moreover, environmental concerns are increasingly significant, and responsible sourcing of raw materials and eco-friendly manufacturing processes are becoming non-negotiable.

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Traditionally, UV-filters are categorized as either chemical or physical. The big difference is supposed to be that chemical agents absorb UV-light while physical agents reflect it like a bunch of mini umbrellas on top of the skin. While this categorization is easy and logical it turns out it's not true. A recent, 2016 study shows that inorganic sunscreens work mostly by absorption, just like chemical filters, and only a little bit by reflection (they do reflect the light in the visible spectrum, but mostly absorb in the UV spectrum).

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