GDS Hair Dye Shampoo Reviews: What 1,788 Buyers Actually Said (Including the 83 Who Weren't Happy)
Type "GDS hair dye shampoo reviews" into a search bar and you get the usual mess: a star rating on a marketplace, a few TikToks, and a brand page that only shows you the happy ones. So we did the thing we're set up to do. We took the 1,788 reviews that came with the product from its previous store and read them as a dataset instead of a highlight reel.
Two things before the numbers. First, we sell this shampoo, so you should read this the way you'd read a car company's crash data: useful, but check our working. Second, we didn't write these reviews and we didn't filter them. They were collected by the product's previous seller between October 2024 and May 2026, mostly through automated post-purchase review requests, and imported to our store with the product. Every one of them is in the count below, including the 21 one-star reviews. Reviews left on dhaliora.xyz since June 2026 are collected separately through Loox and aren't in this dataset; you'll find them on the product page.
1,788 reviews, average 4.8 out of 5: 1,579 five-star, 126 four-star, 53 three-star, 30 at two stars or below. The praise is overwhelmingly about convenience (one in five five-star reviews says some version of "easy"), not about miracles. The complaints, all 83 of them at three stars or lower, cluster into four buckets: it stained hands or towels, it didn't cover heavy white hair well enough, the brown shade ran warm, and the previous seller's shipping. Staining is the one complaint that even five-star reviewers repeat. Wear the gloves.
Where these 1,788 reviews come from
This matters more than the average, so here's the provenance. The reviews were collected on the original GDS store from October 7, 2024 to May 23, 2026. Just over half (990) came through Judge.me's automated review-request emails, 219 through the Shop app's own review prompt, 48 were left directly on the site, and the rest came from other post-purchase flows. 1,037 of them were written in 2024, 627 in 2025, and 124 in the first five months of 2026. When the product moved to DHALIORA, the review file moved with it, and we imported the whole thing rather than the flattering half. None of them have a seller reply. 39 include a customer photo.
About a third of reviewers left a location. Singapore leads with 65, then Seoul with 37, and Australia shows up hard: Melbourne 29, Sydney 27, Perth 13, Brisbane 12. That lines up with where the product had been selling, and it means most of these people are reviewing after a real international delivery, not a next-day domestic one. Keep that in mind when we get to the shipping complaints.
One honest caveat about review-request systems: they skew positive. People who are furious leave a review anyway; people who are mildly disappointed mostly ignore the email. An 88% five-star rate is very good for a hair dye, but it is not the same as 88% of buyers being thrilled.
What the five-star reviews actually praise
We ran simple keyword counts across the 1,579 five-star reviews. Here's what came up most, with the share of five-star reviews that mention it.
| Theme | Five-star reviews mentioning it | Share |
|---|---|---|
| Easy / convenient / simple | 336 | 21% |
| Delivery or shipping (mostly "arrived fast") | 298 | 19% |
| Smell or scent (almost all positive) | 107 | 7% |
| Gray coverage, explicitly | 100 | 6% |
| Repeat purchase ("again", "reorder", "second bottle") | 73 | 5% |
| Staining, gloves, hands | 64 | 4% |
| No mess / clean | 41 | 3% |
| "Natural" looking | 33 | 2% |
Read that top line carefully. The single biggest reason people love this product is not that it covers gray better than a box dye. It's that it turns a 40-minute ritual with a bowl, a brush and a towel into something you do in the shower. That's a real benefit, and it's the honest one. Only 6% of five-star reviewers bothered to say the word "cover." When your hair is done, you don't write an essay about it.
The smell line surprised us. Oxidative hair dye usually smells like a chemistry set, and 107 five-star reviews mention the scent, nearly all of them approvingly. That fits the formula, which is ammonia-free and uses ethanolamine as the alkalizer instead. Ammonia is what gives box dye its eye-watering sting; ethanolamine doesn't evaporate the same way. It is not gentler on the allergen front (more on that below), but it is far gentler on the nose.
The 73 repeat-purchase mentions are the number we trust most. A dye that didn't work doesn't get a second bottle.
What the 83 unhappy reviews say
Eighty-three reviews sit at three stars or below. That's 4.6% of the total. Here's how they break down; some reviews land in more than one bucket.
| Complaint | Reviews (of 83) |
|---|---|
| Messy, stained hands, towels or skin | 25 |
| Didn't cover, or barely covered, the gray | 23 |
| Shipping: slow, lost, or the wrong item sent | 14 |
| Color came out wrong (reddish, dull, too dark) | 14 |
| Faded faster than expected | 4 |
| Wanted it to work on a beard | 4 |
| Itching, burning or irritation | 3 |
Let's take them in order, because each one has a mechanism behind it.
The staining thing
This is the complaint that crosses the rating line. 25 of the 83 low reviews mention it, and so do 64 five-star reviews, usually as "great product, but wear gloves." That is not a formulation flaw you can engineer away. This shampoo is a permanent oxidative dye: the same chemistry as a box kit, built into a cleanser, with p-phenylenediamine (PPD) in the Black shade, PTD (toluene-2,5-diamine) in Brown and Dark Brown, and resorcinol in all three. Those precursors oxidize into large colored molecules wherever they're given a chance, and the outer layer of your skin is a perfectly good place to do it. It rinses off tile and porcelain with soap; on skin and nails it lasts a few days. The reviewers who complained mostly say they applied it barehanded because it looked like shampoo. It is not shampoo. Gloves are in the box for a reason.
"It didn't cover my gray"
Twenty-three reviews. When we read them in full instead of counting them, a pattern shows up: most describe a lot of white, resistant hair (one reviewer estimates 70% white), a single short application, and the expectation of box-dye uniformity. A three-to-ten-minute contact time cannot deliver what a 30-minute kit delivers in one go. Our own guidance is that full coverage on heavy gray typically builds over two to three washes, with the second pass landing darker than the first, and that stubborn white hair does better with the product applied to dry hair for the full ten minutes. Several of the three- and four-star reviews say exactly that they had to go again. That's the product working as designed, described by people who were told it would be quicker.
Interestingly, the time reviewers report using varies wildly. Across all 1,788 reviews, 34 mention leaving it three minutes, 22 mention ten, 12 mention five, 9 mention fifteen, and a handful went to twenty or thirty. The people at three minutes are the ones most likely to say "it was lighter than I expected." The label range is three to ten. If you have a lot of gray, treat three as the minimum, not the target.
The brown that went warm
Fourteen reviews describe the wrong color, and nearly all of them are the Brown shade turning reddish or brassy, or Black reading darker than expected. Brown oxidative dyes are built on a warm base, and the warmth shows most when the shade is too light for the amount of white hair it's landing on, or when it's rinsed early. Black doesn't have this problem, but it also doesn't forgive: it lands exactly as dark as it says. Our practical rule is in the product FAQ: if you're more than half gray, pick Dark Brown over Brown, and if you're buying a single bottle, match the hair you have now rather than the hair you want.
The shipping complaints are about someone else
Fourteen low reviews are about logistics: orders that took a month, one that never arrived, one where the wrong shade was sent and customer service didn't fix it. We're including them because they're in the file, and because we think review pages that quietly drop "not the product's fault" complaints are how trust dies. But these describe the previous seller's operation, not ours. DHALIORA dispatches from Seoul within one to three business days, with a tracking number on every order. What happens after dispatch is the carrier's clock, and we publish the typical ranges on the shipping page rather than promising a date.
Beards, and the three irritation reviews
Twelve reviews across all ratings mention a beard or mustache, and they split: some say it worked, some say it did nothing, one says it irritated the skin. Our answer is simpler than the reviews. Don't. This is formulated and tested for scalp hair. Facial skin is far more reactive to PPD and PTD, and your eyes are an inch away. The same goes double for eyebrows.
Only three of 1,788 reviews mention itching, burning or a rash. That is a low number, and it is also the number we'd least like you to take comfort from. PPD (in the Black shade) is one of the most common cosmetic contact allergens there is and the PTD in Brown and Dark Brown cross-reacts with it, sensitization can appear after years of uneventful use, and a review file only captures the people who reacted and came back to write about it. Patch test behind the ear 48 hours before every application. Not just the first one.
Nerd note: 298 five-star reviews mention shipping, which looks odd for a hair dye until you remember these are mostly Australian, Singaporean and North American buyers ordering from Korea. "Arrived faster than expected" is the second most common thing people said about a hair dye. Delivery anxiety is a bigger part of the international K-beauty experience than any ingredient.
What our screening found
The review file and our ingredient screen agree with each other, which is reassuring. Our screen flagged 16 of the shampoo's ingredients, and two of them, PPD (in the Black shade; Brown and Dark Brown use PTD, toluene-2,5-diamine, instead) and resorcinol (in all three), carry our high-risk grade; they are two of only eight high-risk grades in our whole catalog, and we publish both on the product page rather than behind a "free-from" badge. That chemistry is exactly why staining shows up at every star level, why three people reported irritation, and why the product can cover gray permanently at all. The things reviewers love, the lack of an ammonia smell and the shower-time convenience, come from the ammonia-free base and the shampoo format. The things they complain about come from the same molecules that make it work. There is no version of this product that keeps the first list and loses the second.
Where reviews and our screen disagree with the marketing is speed. Expect full coverage on heavy gray to build over two to three washes, not one, and expect the brown shades to want the full ten minutes.
The product, and who shouldn't buy it
GDS Hair Dye Shampoo — Grey Coverage in 10 Minutes in the Shower
Ammonia-free permanent dye in a shampoo base, three shades. It stains skin and it needs a 48-hour patch test every time; the 1,788 imported reviews are on the product page alongside the newer ones, unfiltered.
Skip it if you have ever reacted to a hair dye or a black henna tattoo, if you want it for a beard or brows, or if you want salon-uniform coverage on mostly white hair in a single three-minute wash. Buy the Dark Brown rather than the Brown if you're more than half gray. And if what you really want is a slow, low-commitment blend rather than permanent color, a gradual reducer is the more honest tool; we compared the options in our piece on how hair dye shampoos work and the PPD question.
How to read any product's reviews
Ignore the average. Read the three-star reviews first, because that's where people describe the product accurately instead of emotionally. Count how many complaints are about the thing itself versus the box it came in. Check whether the negatives are still visible at all, and whether anyone from the brand ever answered them. And look for the repeat buyers; they're the only reviewers who have already spent their own money twice.
If you want to see how we grade the ingredients behind any of this, our screening method is written up here, and the eight ingredients in our catalog that got our worst grade, PPD and resorcinol included, are listed in full here.
- Mukkanna K.S., Stone N.M., Ingram J.R., "Para-phenylenediamine allergy: current perspectives on diagnosis and management," Journal of Asthma and Allergy (2017). link
- DermNet, "Allergy to paraphenylenediamine (PPD)." link
- Scientific Committee on Consumer Safety (SCCS), "Opinion on Resorcinol," European Commission. link
- Vogel T.A. et al., "Two decades of p-phenylenediamine and toluene-2,5-diamine patch testing," Contact Dermatitis (2017). link
