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Effects of various concentrations of Rg2, ASTA and RA on viability of UVB-exposed HaCaT cells. Cells exposed to 700 J/m2 UVB were post-incubated in growth medium or medium containing various concentrations of (A) Rg2, (B) astaxanthin, or (C) their 5:1 combination (RA) for 24 h. The cell viability was determined by MTT assay. Data shown represent the mean values of three independent experiments ± SD. *p < 0.05 and **p < 0.01 versus untreated UVB-exposed group.
