I know because I've used it! It makes my hair feel fuller, more voluminous, and clean too. The scent is light and lovely and I love the price.
This is sulfate-free, paraben-free, cruelty-free, and vegan.
Promising review: "I would give 6 stars if it were possible. I have fine hair. This shampoo leaves my hair light and clean. It doesn't dry it out, and it doesn't weigh it down. It smells great, a little like coconut with a hint of citrus, not cloying or perfume-y. And surprisingly, my wet hair is a bit easier to run the comb through than with my other shampoos. For years I've used a terrific salon product, quite expensive, but with COVID it became unavailable so I figured I'd try something new. Like my salon shampoo, this one is concentrated so you don't need to use much. Even the container is well made with a sturdy cap and a chunky container that is less likely to topple from a shower caddy. And I appreciate the environmentally friendly features. Most of all, though, I'm really happy with what it does to my hair." —Sam
Get it from Amazon for $6.98.