I am very interested to find out more about this as well. I have never heard anyone call this a humectant.
- Silicone is listed as water-binding as well and that isn't a humectant (for my hair at least). She does say that they are water-binding to skin, not hair, as well. Her list of water binding agents: ceramide, lecithin, glycerin, polysaccharides, hyaluronic acid, sodium hyaluronate, mucopolysaccharides, sodium PCA, collagen, elastin, proteins, amino acids, cholesterol, glucose, sucrose, fructose, glycog en, phospholipids, glycosphingolipids, and glycosaminoglycans. Pretty much everything...
- This website also proposes that sodium lauryl/laureth sulfate is safe and gentle on hair. I know that this is not true for my hair.