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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.

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.

Great shampoo. Love the added biotin and collagen. Makes my hair look so shiney and silky. Also my hair smells beautiful.

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.

So far so good! Great product so far within a week of using it. I’m very oily hair and this keeps its pretty light weight and soft after. I use it with a scalp massager for a deeper cleanse. Only reason I give it 4 stars is the rose smell (reminds me of old lady perfume). However, it smells nice once it’s dry and is very faint.

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.

This shampoo removes buildup, provides shine and the scent is ok. But it seems a bit too astringent and leaves my hair a bit dryer geeling than I'd like.

We recently moved to a new area (and therefore new water supply) and I’ve had a difficult time finding a shampoo that doesn’t leave by hair feeling coated and weighed down. This has a great lather, super clean feel, easy on my fine hair - doesn’t weigh it down at all, and has a pleasant but not overwhelming scent.

Ho i capelli fini e da quando uso questo shampoo non riesco più a farne a meno! me li deterge senza seccarli o appesantirli. Lo adoro! Soffro di dermatite ma questo non mi dà noia.

Super shampoo

My scalp is oily and this shampoo gently cleans it. No itchy scalp for two days.

Pros: doesn’t leave hair greasy Con: expensive, smells bad, leaves a coating on your hair that requires a deep cleansing shampoo after many uses, leaves hair dry and frizzy. Very disappointed.

Really great shampoo for fine, flat hair. It doesn't work miracles, you won't magically have full, thick hair... but it keeps my hair grease-free for 2 days (which is good for my hair type), smells great, and keeps my hair feeling soft and knot-free. The price is the best I've found online or in-store for this product and size. Same goes for the OUAI Fine Conditioner on Amazon.