Hi Heather, From my experience and reading - no preservative is necessary - lye kills everything! I've made many batches of soap with avocado, cucumber, aloe vera gel, dried herbs etc with no adverse affects or DOS. I also think it depends on the % you use - I use about 5% of the oil total for avocado and cucumber and sub out water. HTH Liz ----- Original Message ----- From: Robert & Heather Manusauloa To: soapcraft@xxxxxxxxxxxxx Sent: Friday, May 21, 2010 1:30 PM Subject: [soapcraft] Preservatives in Soap Hi Eveyone The weekend is nearly upon us again! Yay! Can anyone tell me please what is a good general preservative to use in soap when adding odds and bods like aloe vera (from homegrown plants) avocado or real carrot/beetroot juice and things like that. Thanks Heather