The hair thickening shampoo we’re talking about is John Frieda’s ULTRAfiller+ Thickening Shampoo. Per the brand, it was made to help you achieve 200% thicker and fuller hair “instantly.” ...

Typically, thickening shampoos accomplish this goal by coating individual strands with ingredients to plump them up to appear thicker. Strengthening hair follicles with ingredients like keratin ...

and for a good reason—it’s tough to beat as an all-around thickening shampoo for thinning hair. This indie-luxe favorite is packed with proven ingredients that not only boost volume but also ...