Watch this before you buy another hair serum... We ran a blotter paper test to prove why the Hydra Source Moisture Method Hair + Scalp Serum is in a league of its own. ✨ Maximum moisture retention 🚫 Zero greasy residue 🔁 Layerable all day long (apply, re-apply, repeat!) #Hydraserum #Biolage #Haircaretips #Haircare #Hairhydration