Rescue MD is a lightweight water-based serum built around Osmosis's patented ozonized ethyl oleate — the ingredient they call Trioxolane — paired with madecassoside from centella. Schisandra, guava fruit and Pseudoalteromonas ferment extract round it out. It has no oil, no fragrance and a very short ingredient list. Osmosis positions it for the look of redness and surface damage, and for skin that has been through something.

We reach for it with reactive, blemish-prone and easily flushed skin, and in the days after a treatment. It goes on cleansed skin before your other serums and moisturizer, morning and night. Osmosis does not publish a percentage for the Trioxolane. One practical note: it absorbs almost instantly and layers under everything, so it is rarely the reason a routine feels crowded.