Sorry to bug you, but I was wondering if you could tell me about Polyaminopropyl Biguanide. I've heard that is is a safe preservative, but I'm assuming it's synthetic and not really that healthy. Thanks for the help and take care!
Thanks for your question! I've just posted my analysis of Polyaminopropyl Biguanide to the blog. Check it out: http://chemicaloftheday.squarespace.com/todays-chemical/2009/9/5/polyaminopropyl-biguanide.html