Serum z vodno lahko formulo derivata azelaične kisline (Potassium Azeloyl Diglycinate ali PAD).
Water, Potassium Azeloyl Diglycinate, Propanediol, Glycerin, Methyl-Gluceth 20, Allantoin, Hydroxyethylcellulose, Xanthan Gum, Citric Acid, Ethylhexylglycerin, Phenoxyethanol Raziskave: Journal of Drugs in Dermatology, September 2015 | Volume 14 | Issue 9, Azelaic Acid: Evidence-based Update on Mechanism of Action and Clinical Application Berardesca, Enzo, et al., Journal of cosmetic dermatology 11.1 (2012): 37-41. Viyoch, Jarupa, et al. , Current Therapeutic Research 71.6 (2010): 345-359.