Topical active ingredients rarely lose potency due to raw chemical flaws, as failure typically occurs because the underlying delivery vehicle breaks down prior to reaching target receptors within the stratum corneum. Standard oil-in-water emulsion bases tend to undergo thermal phase inversion when exposed to elevated ambient temperatures, causing structural separation that prevents active...
Trying to fix acne-prone skin when it's hot out by scrubbing away every bit of surface oil usually makes things worse. When you wash off those essential barrier fats, your oil glands just get triggered into overproducing even more grease to make up for it. High-pH bar soaps strip off the protective acid mantle, creating an environment where acne-causing bacteria multiply easily while the skin...
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