Is 1% of water ok without preservatives?
I recently watched a video/class on incorporating water based extracts into oil based serums. They used only 1% of water, the extract and a solubilizer, then they incorporated that into the oil-serum. They said a preservative wasn’t necessary because it’s not enough water to grow micro-organisms.
I just want to verify this statement. Is it true?
Thank you. 🙂