The job of a preservative is to prevent the growth of microorganisms that would otherwise contaminate the product. So by their very nature, preservatives must be somewhat destructive in order to successfully perform this job. There are, however, a wide range of alternatives to conventional parabens and many of these offer substantially fewer health risks than others. The preservative used by Salon Naturals in its hair care products is recognized by the trade name Geogard Ultra. This preservative is manufactured by Lonza and presents a multifunctional alternative to more traditional systems through the use of hurdle technology.
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Sodium lactate Rosemary antioxidant Vitamin E I encourage you to do your own research and decide for yourself which preservative will work best for you. I also encourage you to read everything about the preservative from the supplier to determine if it will work for you. Effective pH range and solubility are important things to consider.
So, with all that in mind, for relatively foolproof preserving, I usually use Liquid Germall Plus. It is water soluble, effective in small amounts, and has a broad effective pH range 3—8. You are unlikely to need to test the pH or adjust it. It has a usage rate of 0. With the tiny inclusion of those scary ingredients, the rest of your formula will be protected from other scary things, like fungus and mould.
In a g batch of lotion, that translates to 0. Please see my Resources page for a list of links to places to purchase ingredients including preservatives. How much do I need to use? Each preservative will have a different recommend usage rate, which you can get from your supplier. I made a handy-dandy preservative calculator that you can use here.
Figure out how much your recipe weighs. Either add up the weights of all the ingredients or weigh the final product. Figure out the recommended usage rate of the specific preservative you are using.
Your supplier will provide this. Multiply the weight of your product by the usage rate percentage, and divide that number by So, if your concoction weighs 50g and the usage rate is 2. That means you should add 1.
Geogard ECT Ecocert
Geogard ECT Preservative