Fig. 2.

The effects of RG formulation with preservative on the growth of C. acnes (A), S. epidermidis (B) and S. aureus (C). Untreated means that only RG formulation (1 mg/mL) was treated. Each bar concentration of each preservative was as follows. Potassium sorbate, sodium benzoate, and sodium propionate: 2, 1, 0.5, 0.25 mg/mL, 1,2-HD: 20, 10, 5, 2.5 μL/mL, 2-phenoxyethanol and 1,2-octanediol: 2, 1, 0.5, and 0.25 μL/mL. Results are presented as means ± SD (n = 3).