Fragrant oil that can have antimicrobial properties, but also can be a skin sensitizer or irritant. [1,2] Geranium extract is a very good antioxidant for skin, and the parts extracted are usually not fragrant, thus presenting minimal risk of irritation. 
- Larsen W, Nakayama H, Fischer T, Elsner P, Frosch P, Burrows D, Jordan W, Shaw S, Wilkinson J, Marks Jr J, et al. Fragrance contact dermatitis: a worldwide multicenter investigation (Part II). Contact Dermatitis.. 2001;44(6):244-6.
- Dorman H, Deans S. Antimicrobial agents from plants: antibacterial activity of plant volatile oils. J Appl Microbiol. 2000;88(2):308-16.
- Radulovic N, Stojkovic M, Mitic S, Randjelovic P, Ilic I, Stojanovic N, Stojanovic-Radic Z. Exploitation of the antioxidant potential of Geranium macrorrhizum (Geraniaceae): hepatoprotective and antimicrobial activities. Nat Prod Commun. 2012;7(12):1609-14.