I've been fighting this flu all week and it hit me again today. Sorry for the short post!
The facial cleanser/scrub recipes I've been posting lately are gentle enough to use very day, but a lot of skin types cannot handle every day exfoliation. Therefore, although I consider the surfactant based cleansers gentle enough for every day use, the versions containing exfoliants might not be. Figuring this out really is about trial and error.
If you use water or water like ingredients in a product - anything water soluble like water, hydrosols, aloe Vera, and so on, you MUST use a preservative. There are no exceptions to this rule. If you make an anhydrous product - a product that doesn't contain water - you don't need to use a preservative. You might want to use an anti-oxidant like Vitamin E, but you don't need a preservative. If you make an anhydrous product that might come into contact with water, like a salt or sugar scrub, you should include a preservative. Include an anti-oxidant if you wish. Remember to choose a suitable preservative, like Phenonip, designed to be used with anhydrous products. (Yes, it contains parabens because they work well in anhydrous environments.)
Thanks for your suggestions for epic book series. Keep them coming!
And avoid this flu! It is awful!