Mitochondrial activity of human dermal fibroblasts grown in a pure cultivation medium and in media with unmodified curcumin (C), or with curcumin degraded at 180 °C (DC 180) or at 300 °C (DC 300) in various concentrations (0.01, 0.05, 0.1, and 0.5 mg/mL) on days 3 and 7 after adding the agent. Arithmetic mean ± SD from 4 measurements, ANOVA, Student–Newman–Keuls method. Statistical significance (p ≤ 0.05; depicted above the columns): * compared with cells cultivated in the pure medium; C or DC 300 compared with cells cultivated in the medium with C or DC 300 of the same concentration.