Protein is everywhere in hair care. If your hair feels damaged, you are told to add protein.If it feels weak, you are told to strengthen it.If it feels frizzy, protein is often suggested again. But protein is not automatically helpful. And in some cases, too much can make hair feel worse. So what is actually happening? What protein does to the...

What the research says about residue, coating and scalp balance If your hair feels heavy, flat, coated or dull even after washing, your conditioner might not be “too rich” — it might be creating build-up. Conditioner build-up is widely discussed online, but what does the science actually say? Research into hair fibre chemistry and cosmetic formulation shows that certain conditioning agents...