Undisclosed Possibly Unsafe Preservative [SEP] They are a great size and moisturizing but the reason for one star is because of the undisclosed use of the preservative Polyaminopropyl Biguanide and the amount :15 (1) of Regulation (EC) No. 1223/2009 on cosmetic products. ... On the basis of the data available, the SCCS concludes that Polyaminopropyl Biguanide (PHMB) is not safe for consumers when used as a preservative in all cosmetic products and in cosmetic spray formulations up to the maximum concentration of 0.3%.