Figure 3. Changes in the parameter of maximum skin deformation, R0 , before (T0 ) and after (Tf ) treatment with the test gels; all variations were highly significant (p < 0.01).

On the contrary, all gels induced a decrease in maximum skin stretchability R0, ranging between -32.2% and -40.8%, which is highly significant (p < 0.01). This means all the tested products made the skin firmer (see Figure 3.)