I was going to order from CO organics. I called & spoke to the owners b/c I had a question re the preservatives or any other additional additives. she mentioned to me that their current batch is: 99% marine algae,.5%citric acid & .5% prop. glycol. she mentioned their next batch will have a preservative similar to optiphen( which I prefer). Im going to wait a bit b/4 I order to try get my order from the new batch if I cant find it any where else W/ out the p gylcol