Some good hair thickening products are the Pantene Pro-V Full & Thick Collection, Bumble and bumble Thickening Shampoo and Conditioner and Kiehl's Ultimate Thickening Shampoo. Kiehl's also makes a Rice & Wheat Volumizing Conditioning Rinse that works well for thickening hair.
One of the best-smelling hair thickening products on the market is the Paul Mitchell Tea Tree Lemon Sage Thickening Shampoo and Conditioner set, states Good Housekeeping magazine. This Paul Mitchell hair-care duo thoroughly cleanses and leaves hair weightless, and is particularly helpful for thickening blond hair. However, it does not work as well for thickening gray hair.
One hair thickening product that is especially good for gray hair is the Samy Fat Hair "0" Calories Thickening Shampoo and Conditioner. The lab technicians at Good Housekeeping magazine found that this product created the highest increase in hair-shaft diameter for gray hair out of all of the products they tested. This Samy Fat Hair thickening set is not recommended for those who dye their hair, as it can fade the color.
The Nexxus Diametress Luscious Hair Thickening Shampoo and Sublime Volume Luscious Bodifying Conditioner are two of the best hair thickening products available as of 2015. This hair-care set not only greatly increases the diameter of hair, but it also makes it softer and easier to manage. These products work well for adding volume and body to any type of hair style, although they are not always the best at combating frizzy hair or flyaway strands.