Unfortunately not every woman on the planet is blessed with a head of voluminous, envy-worthy hair. Some of us are victim to fine strands and flat roots, whether as a result of genetics or years of styling. While there are various steps you can take to prevent your hair from thinning (an antiaging routine, intensive conditioning treatments, ditching unsafe towels, etc.), it all starts with your shampoo. After all, a proper hair regimen begins and ends with keeping your scalp healthy. Here, the best thickening and volumizing shampoos that’ll bring your mane back to life.