Fig. 4.

Lipid-peroxidation (LPO) levels measured by MDA content on the skin cells. a (Basal) — mean concentration of MDA (µM) for the thirty subjects before UVA exposure; b LPO (4 h after UVA exposure) — mean variation in percentage (percentage variation vs baseline (T0) 4 h after UVA exposure) and LPO (24 h) — mean variation in percentage (percentage variation vs baseline (T0) 24 h after UVA exposure). Data are presented as the mean of MDA ± SEM in µM MDA. Statistical significance was considered at p < 0.05 (*p < 0.05, **p < 0.01, and ***p < 0.001)