9 Best Shampoos for Thinning Hair 2025, According to 3 Testers

This volumizing shampoo gives fine, flat hair volume where it matters: at the roots. Hydrolyzed collagen helps strands feel fuller, while moisturizing ingredients like macadamia butter, shea butter, and coconut oil add shine and nourishment without weighing hair down or making it look limp. As a nice bonus, it's sulfate- and paraben-free so it's safe for color-treated hair, and it comes in a recyclable bottle.

What our testers say: “I've been using this shampoo and conditioner for about two to three weeks, washing my hair twice a week instead of my usual once-a-week wash,” says tester Bailey Gunn. “It was super easy to add to my routine, has an incredibly clean scent and lathers really well when massaged into my scalp. It's also super lightweight.” In just a few weeks, her roots are already becoming healthier and her volume is noticeably increasing. “I often wear my hair slicked back or up, but after washing it feels so healthy and voluminous that I can let it down naturally for days on end.”

Best Personalized Shampoo for Hair Growth: Prose Custom Shampoo

• What we like: Specially designed to solve individual problems; sulfate-free; safe for color and keratin
• Worth noting: Our tester thought the texture was a little heavy.

If an all-purpose shampoo has never worked for you, Prose may be the answer. Each formula is custom-made to suit your hair type, texture, density and goals—so you can combat oily roots and thinning at the same time, for example. The brand uses natural, science-backed ingredients like biotin, acacia collagen, and apple cider vinegar, but exactly which ingredients are in your bottle is up to you and the information you provide about your unique concerns. We love how seamlessly it fits into a complete daily routine. You can combine your custom shampoo with a custom conditioner, scalp serum, hair mask and more, making it one of the most comprehensive hair care systems out there.

What our testers say: Tester Nancy Laoback, who has beautiful straight hair and suffers from postpartum hair loss, said she noticed real improvement after about a month. “My hair overall looks noticeably smoother, shinier and softer,” she says. “It gave my hair a normal volume without weighing it down and helped my hair stay fresh longer between washes.” While she didn't notice a drastic change in volume, she appreciated how healthy her hair looked and felt, especially when combined with the appropriate conditioner. “It melted easily into my hair without leaving any residue,” she says. “My hair felt hydrated and nourished without being weighed down.” Her only criticism? “The texture seemed too viscous and plastic to me.”