[Misc.] What's the science behind a lot these "it looks and feels smoother stories?"

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I like this sub for a lot of reasons, but often finding it lacking in scientific credibility. While there's a lot of testimonials talking about how toners, moisturizers, etc. have taken years off a face, I usually haven't seen accompanying scientific analysis for what exact chemicals or treatments cause such a reaction in the skin. I'm a tad bit skeptical and would love to learn how something works in order to verify its credibility.I'm sure a lot of members here feel the same way and it's frustrating because there's usually not a dermatologist on hand when we try to change up our routines. Unfortunately, looks aren't convincing enough.
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Submitted by Plucky_Cosmic_Relief