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From ozonated glycerin to transdermal magnesium — plain-language guides rooted in peer-reviewed research. Start with a pillar guide below, or filter by ingredient in the sidebar.

Arnica is one of the oldest named ingredients in European herbalist skincare — a small yellow mountain flower that has appeared in balms and salves across Alpine and Eastern European traditions for centuries. Here is a factual look at the ingredient, what shoppers reach for an arnica balm for, and how to choose one.