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Sometimes a tiny letter can make a huge difference. Make you question things, for example. In cosmetic science, that letter is usually a „v“.
Why a „v“ you ask?
And imagine how great it would have been had I said a „y“ -Y a „y“?
Because „in vivo“ sounds pretty similar to „in vitro“, but in terms of results there is a huge difference.
See, many ingredients proove their claim on human cells. In the lab, in petri dishes, swimming in a special broth. Which is NOT the same as being attached to a moving human being, always on the run and with many other cofactors like sweat, spf and (other) sexy things (for the sake of the alliteration) that could impede penetration.
Because skin is actually designed to stop things from penetrating (as we have learned here), and we can´t switch that off on demand.
But why am I going on about the difference the „v“ makes? Because when it comes to peptides, there are two different camps. The „It works“ one and the one that will tell you that peptides are too big to penetrate the skin „in vivo“ and thus are a waste of money.
And if you haven´t made up your mind yet, The Ordinary Matrixyl 10% + HA will let you see for yourself without breaking the bank.