These are humectants often added to hair care products.

Humectants are added to hair care products because they attract water to the hair to keep the moisture content high.

1,2,6 hexanetriol
Butylene Glycol
Dipropylene glycol
Glycerin
Hexylene Glycol
Panthenol
Phytantriol -- enhances moisture-retention, increases absorption of vitamins, panthenol, and amino acids into hair shaft, imparts gloss
Propylene glycol
Sodium PCA
Sorbitol
Triethylene glycol
Polyglyceryl sorbitol
Glucose
Fructose
Polydextrose
Potassium PCA
Urea
Hydrogenated Honey
Hyaluronic Acid
Inositol
Hexanediol beeswax
Hexanetriol Beeswax
Hydrolyzed Elastin
Hydrolyzed Collagen
Hydrolyzed Silk
Hydrolyzed Keratin
Erythritol
Capryl glycol
Isoceteth-(3-10, 20, 30)
Isolaureth-(3-10, 20, 30)
Laneth-(5-50)
Laureth-(1-30)
Steareth-(4-20)
Trideceth-(5-50)