I've been wondering about this for a while. I don't see palmitic acid much in moisturiser ingredients lists, apart from when it's part of an emulsifier (e.g. some of the Lucas Meyer ones) or part of the stearic+palmitic acid combination.
I find it helps with moisturisation of emulsions. Is there any reason it's not used much in general, or as much as stearic acid (I find stearic acid has a "scratchier" afterfeel)? Are there any downsides that I don't know about? Is it drying in the long run or something? Or consumers/marketers just don't like that it has "palm" in the name? I feel like this is something @Pharma