Buying guide for best hair-thickening shampoos. Our experts recommend these hair thickening shampoos from top brands like Pantene, Garnier, Aveda, and more to make fine, limp hair look fuller, thicker, and more voluminous. Their Revita Hair Stimulating Shampoo gives your hair and skin a real boost, stimulating … Search Subscribe Dealing with fine, thin, or flat hair? Individuals with fine, thin, or aging hair often notice a dramatic difference in fullness with the right hair-thickening shampoo. If your hair goals include having a big, bouncy, voluminous mane, a hair-thickening shampoo can be a great way to help your hair appear fuller and thicker. Revita Hair Stimulating Shampoo Our pick for the best overall hair thickening shampoo comes from DS Labs, whose smart, scientifically innovative products always standout. Try ones of these 10 best hair thickening shampoos, from brands like Amika, Kerastase, Ouai, OGX, Oribe, R+Co, and more.