OUAI Fine Hair Shampoo - Volumizing Shampoo for Fine Flat Strands - Made with Biotin Keratin Chia Seed

I bought the OUAI Medium Shampoo Refill because I needed something gentle enough for color-treated and keratin-treated hair, and it has worked really well for me. It cleans thoroughly without stripping, and leaves my hair feeling soft, smooth, and healthy. The formula has just the right balance—rich enough to nourish my hair, but not heavy or greasy. The scent is light, clean, and really pleasant, and it pairs perfectly with the matching conditioner. One of my favorite things about this refill is how cost-effective it is. You get a much larger amount for the price, and it’s more eco-friendly since it uses far less plastic than buying multiple bottles. If there’s a minor downside, it’s that using too much can feel a little rich, so a smaller amount works best—especially if you have finer hair. But overall, this shampoo has been a great option for maintaining both my color and keratin treatment. Overall: High-quality shampoo, gentle on treated hair, great scent, and a smart buy in the larger refill size. I’ll definitely keep repurchasing. Read more

Have have lots of haie but it's very fine. I was looking for a shampoo thst wouldn't weigh it down and this was recommended on every Google search I looked at. I really like it but the scent is very strong. It just smells super clean, less like a perfume scent feom other shampoos. But my hair isn't weighed down, it has volume to it and I noticed a difference after just 1 wash. I plan to keep using it and will buy it again. Read more

I’ve been using OUAI Medium Shampoo, and it’s officially a staple in my shower. This shampoo is the perfect balance—it cleans deeply without stripping, and leaves my hair feeling soft, light, and fresh instead of dry or heavy. The scent is clean, luxe, and salon-level good without being overpowering. It makes washing my hair feel like a mini self-care moment rather than a chore. A little goes a long way so start small and work your way up as needed. Final verdict: If you want healthy-looking, bouncy, clean hair that still feels moisturized and touchable, this shampoo delivers. Worth every drop. Read more

Lovely, mild fragrance! It was just as Witecutter said “great for fine flyaway hair”. It had great lather and only one soaping needed. The plastic bottle is a little hard for aging hands to squeeze. Read more

Only used it once so far, but it seems very nice for my thin hair. Worth a try, even though its $$$$. Read more

I should probably use this longer before truly reviewing but I was so thrilled I needed to write a review after just one wash !!! I have very fine, thin & straight hair. It tends to get greasy soooo easily (cant speak on that because it’s been two hours since my shower) but I’ve never had a shampoo that helps in that department. Anyways I will say my hair has absolutely no frizz/ flyaways which I usually get.. It is so soft as if I just went to a salon & smells fabulous. My fiancé who also has pretty fine hair but completely different texture and is curly also said his hair felt soo soft and he really likes it. It lathers fantastic which is important to me. I tend to not feel like my hairs not getting clean without a good lather. I bought this not expecting much just figured I’d give it a go and it’s an unexpected 10. Read more

It arrived as expected, and works well. I purchased the refill pouch because it'll last me a very long time, as I only use a tbsp amount to wash my waist length hair. It's not heavy or greasy, and it smells divine. On another note, if you're looking for OUAI scents that smell like this shampoo, you're closest match will be Dean Street or North Bondi. Read more

I love these bags for our dispensers it's so much easier to refill and I'm getting more product out. I also really like the product. I can tell my hair feels and looks healthier and fuller after using this product. My husband even loves to use it on his hair. Luckily we have the same hair type. Read more