03.06.2003· Caffeic acid, both free and esterified, is generally the most abundant phenolic acid and represents between 75% and 100% of the total. SkinMedica TNS Essential Sem is an anti-aging breakthrough bining the renowned growth factor sem, TNS Recovery Colex in one chamber and APS … iS Clinical is an established US cosmeceutical skin care brand dedicated to developing effective products that restore optimum skin health for people suffering from a. Get familiar with what this cosmetic brand has to offer. Learn about the brand philosophy as well as our take on what makes them great and what we think they could.