I had a question about preservatives. I’ve been making lip glosses and lipsticks. I’ve successfully made a few with recipes I found via Google and now I’m trying to modify them myself. I’ve been adding a preservative to my formulas at .5% of the total formula. However, it’s been making my lips go numb if I add more than .02%. I’m pretty much the gold standard for allergic reactions. If someone is going to have an allergic reaction to something it will be me, so I’m making the assumption that this is what the issue is. If my assumption is wrong, please let me know.
Is there a hard and fast rule for how much preservative you should add to your products? Specifically, products without water. I’ve been trying to stay within the same range as the formulas I modify, but eventually I’d like to make my own formulas.
Can anyone recommend a different preservative for lipstick / lip glosses and a dry powder preservative for loose eyeshadows? I’m not sure which ingredient in the preservative is causing the issue I’m experiencing.
I’ve been reading that soap doesn’t need a preservative because of the PH, but a huge portion of soap making information is written by hobbyists/bloggers without a chemistry background so I’m not sure how reliable that information is. Is this true or should I add a preservative to cold process soaps?
Thank you for the help.
Preservative INCI: Phenoxyethanol, Caprylyl Glycol, Potassium Sorbate, Hexylene Glycol.