Over 4,000 bottles of this hair thickening shampoo were purchased on Amazon in the last month, and it's a must-grab for thinning hair.

You can also combine it with other John Frieda Frizz Ease products ... better for parents of curly-haired children. “This has been a great product for my hair, which is very long, thick and ...

“I can’t believe how much thicker my hair feels,” raved one fan. “I use the shampoo, conditioner ... It might just be the result of John Frieda’s expert formula, infused with biotin ...