Ouai Fine Hair Thickening Shampoo
- 10 fl oz thickening shampoo
- Biotin, hydrolyzed keratin, chia seed oil
- Free of sulfates, parabens, phthalates, gluten
- Color- and keratin-treatment safe
- Mercer Street scent: Italian lemon, iris, white musk
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A gentle volumizing shampoo for fine hair that strengthens without stripping, with a signature scent, though volume grows most with the matching conditioner and spray.
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ASIN: B084BW599KCategory: Hair Shampoos
Overview
OUAI made this shampoo for fine hair, cleaning gently while biotin reduces breakage, keratin adds shine and chia seed oil builds volume. It is safe on color and keratin treated hair and smells of lemon, iris and white musk.
Bounce and strength without heaviness suits fine hair that falls flat. The brand pairs it with its conditioner and thickening spray, so the shampoo alone gives part of the result.
Who it's for
Fine or thinning hair that tangles and snaps will feel stronger and fuller. Coarse, dry hair may want a richer, moisturizing shampoo.
Pros and cons
- Volume without stripping
- Biotin for less breakage
- Color and keratin safe
- Full result needs the matching routine
- Scent is noticeable
- Light moisture for dry hair
Performance notes
A gentle cleanse removes oil without stripping, so roots lift more easily. Chia seed oil and keratin coat each strand lightly, adding thickness and shine without weight.
Specifications
| Brand | Ouai |
|---|---|
| Dimensions & fit | |
| Item Weight | 0.79 pounds |
| Item Dimensions | 2.5 × 2.5 × 5.5 inches |
| Capacity & performance | |
| Liquid Volume | 10 fl oz |
| Age Range Description | Adult |
| Construction & materials | |
| Material Type Free | Gluten Free, Paraben Free, Phthalate Free, SLS Free, Sodium Laureth Sulfate Free |
| Suitable Hair Color | All Hair Colors |
| Included components | |
| Unit Count | 10 fl oz |
| Other details | |
| Hair Type | Fine |
| Active Ingredients | Biotin, Chia Seed Oil, Hydrolyzed Keratin |
| Item Form | Liquid |
| Scent Name | Mercer Street |
| Number Of Items | 1 |
| Product Benefits | Volumizing |
| Other Special Features Of The Product | Not Tested On Animals |
| Recommended Uses For Product | Split Hair |
| Item Highlight | Volumizing & Strengthening Keratin & Chia Seed Oil for Women & Men - Lightweight, Color Safe, Sulfate Free |
Frequently asked questions
How do I use OUAI Fine Hair Shampoo?
Apply to roots and work through to ends, then follow with OUAI Fine Conditioner.
Is OUAI Fine Hair Shampoo safe for colored hair?
Yes, it is safe for color-treated, keratin-treated and chemically processed hair.
Is OUAI Fine Hair Shampoo sulfate free?
Yes, it is free of sulfates, parabens, phthalates and gluten.
What does OUAI Mercer Street smell like?
Italian lemon, iris and white musk.