You need a "bridge" like egg yolks (lecithin), mustard, or honey to bond the oil and water.
Perfect for oily or combination skin, or as a "moisture sandwich" layer under heavier creams in winter. emulsion
If a heavy cream feels like too much, but a serum isn't enough, your skin is craving an emulsion . Why they work: You need a "bridge" like egg yolks (lecithin),