Swiftcraftmonkey blog site has some very interesting info on natapres, and it makes good sense what she has seen as some confusing flaws, and like you said, it is more expensive, but seems like your paying for the glycerin its desolved in?????
Geogaurd seems like it would work, but I have read several reports from people who used it and had severe PH drift days and even weeks after the lotion was made, which means your lotion could destabalize at any time.
Also it has Benzyl Alcohol in it, and I have read many evidence based reviews on it being toxic even though it is used in all kinds of stuff, but that doesn't change the fact that its toxic to life.
Neodefend has Sodium Benzoate in it which is used in food, but studies shows that it can react with Vitamin C I believe to create a carcinogenic
chemical or compound or something or another,
What I would like to see is a preservative made with Gluconolactone like in Neodefend, Aspen bark extract, Leucidal, Sorbic acid like in Geoguard, and Elderberry Extract. IF IT WOULD WORK, and I'm kinda wondering why no one has done so yet.
I have used Willow Bark extract and Neodefend together. Granted, I am using the willow bark as a gentle exfolliant in a face cream, and not as a preservative specifically, but it does have the capability to work as a preservative. I would not recommend using it as your sole preservative. However it works very well with Neodefend/Geogard (they are the same item, just sold by different suppliers). GIve it a try.
Or maybe I can mix Leucidal, Aspen Extract, and Elderberry Extract to get an ultimate, natural preservative???
You can mix them yourself- I use Neodefend/Geogard with Potassium Sorbate and have excellent results.
This is just my limited understanding of these things as a home crafter, none of which I"M claiming is fact, so if I'm wrong, please input.
I'm going to call the company that makes these preservatives and ask them some questions on Monday when they open, but in the meantime, any input would be gratfully appreciated as its a burning topic for me