Huberman Lab
Dr. Teo Soleymani: How to Improve & Protect Your Skin Health & Appearance
Dr. Teo Soleymani
And what has to happen is retinol needs to be converted in a two-step process to become active retinoic acid. Otherwise, it's a completely inactive prodrug, which is sold over the counter at concentrations that are not biologically active. That's how cosmeceutical companies can get away with prescribing this for people of childbearing age.
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