Skin moisture
The moisture level or hydration state of the skin of the face was measured with a Corneometer® (Courage + Khazaka Electronic GmbH, Cologne, Germany). As with the Mexameter®, the test site was the cheekbone area. The Corneometer® uses capacitance to measure the moisture content of the stratum corneum.
Skin firmness
Skin elasticity was quantified with a Triplesense TR-3 sensor scan device (Schott Moritex Corporation, Saitama,Japan).