Table 2. The solubility of Azelaic acid in different oils, surfactant, and co-surfactants (mean±SD, n=3) .

Phase type	Excipient	Solubility (mg/mL)
Oil	Oleic acid	0.182±0.07
	Transcutol-P	3.02±0.22
Surfactant	Tween 80	0.313±0.14
	labrasol	4.09±0.2
Co-surfactant	Capriol 90	0.19±0.03