24 Best Volumizing Shampoos for Flat Hair (Tested/Reviewed 2023)

The Living Proof Full line is basically cult-favorite status at this point (I've been using it since high school, FWIW) and the collection's shampoo is still one of the best volumizing shampoo I've tried. It uses a mix of gentle cleansers that help remove oil and grime without drying out my hair, plus it coats my hair in a light layer of moisture so it looks nice and shiny too.

I typically shampoo with this once or twice a week, then follow up with an ultra-lightweight conditioner. I notice my hair feels smooth and healthy, but has so much volume and bounce, especially when I blow dry with a round brush. Chef's kiss, bb.

  • Key ingredients: Amaranth seed extract
  • Sulfate-free? Yes
  • Hair type: Fine, oily, color-treated
  • Scent: Warm
  • Size: 8 fl oz

Glowing customer review: "I have been using this shampoo for seven years now. I have thin, curly hair and a sensible scalp, and this shampoo doesn’t irritate me and properly cleans my hair without leaving it oily like some other shampoos. After using this shampoo, my hair is clean and shiny, and it gives me volume."

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