Figure 5: Cytotoxic effects of standardized geranylgeraniol extract in 3T3 basal cells. The cells (3 × 10⁴ cells/mL) were treated with nine concentrations of geranylgeraniol (0.39–100 μg/mL) for 48 h, and cell viability was evaluated by neutral red uptake assay. Results represent the mean ± standard deviation of three independent experiments using six replicates