Index / Secret Key / Starting treatment essence
Secret Key

Starting treatment essence.

Secret Key Starting treatment essence
Mists & Essences

About this product

A lightweight hydrating essence toner with galactomyces ferment and brightening ingredients designed to boost hydration, even skin tone, and reduce hyperpigmentation.

Best for

Combination skinNormal skin
Mists & Essences

The Guru Index verdict

86%

Approved

Approved · 86%
2Reviewers
2Approved
0Mixed
0Skip

What the gurus are saying

Gurus consider this a standout bargain alternative to luxury essences like SK-II, with consistent praise for its hydration and hyperpigmentation-fading effects. The galactomyces ferment and arbutin are flagged as the key active ingredients. Reviewers emphasize it rewards patience (results may take time but compound with regular use) and appreciate that the formula has improved. Universal enthusiasm across all feedback.
Synthesized from 2 expert reviews

Key actives & flags

Fragrance-freeAlcohol-free

Full ingredients

Water, Glycerin, Butylene Glycol, Arbutin, Galactomyces Ferment Filtrate, Aloe Barbadensis Leaf Juice, Anthemis Nobilis Flower Extract, Centella Asiatica Extract, Camellia Sinensis Leaf Extract, Physalis Alkekengi Fruit Extract, Acanthopanax Senticosus (Eleuthero) Root Extract, Ganoderma Lucidum (Mushroom) Extract, Panax Ginseng Root Extract, Velvet Extract, Cordyceps Sinensis Extract, Hamamelis Virginiana (Witch Hazel) Extract, Oryza Sativa (Rice) Extract, Portulaca Oleracea Extract, Zanthoxylum Piperitum Fruit Extract, 1,2-Hexanediol, PEG-12 Dimethicone, Pentylene Glycol, Adenosine, Phenoxyethanol, Disodium EDTA

Every take, in full

What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Approved only Skip only Mixed only Hide sponsored
Approved
"Secret Key Starting Treatment Essence. I declared this to be my all-time favorite Korean skincare product. Absolutely love it. If you want hydration, if you want plumping, if you want great hyperpigmentation boosting, this is the toner for you. It's inexpensive. It costs like £10 versus it's the dupe for the SK2 essence which is like £100. Same product. I like the rose one. They do a plain one as well. Absolutely love this."
Top Pick: korean skincare product
All 7 takes from Mad About Skin
GREATEST KOREAN SKINCARE 2026 - K-Skincare Favourites (Summer Edition)
"Secret Key Starting Treatment Essence. I declared this to be my all-time favorite Korean skincare product. Absolutely love it. If you want hydration, if you want plumping, if you want great hyperpigmentation boosting, this is the toner for you. It's inexpensive. It costs like £10 versus it's the dupe for the SK2 essence which is like £100. Same product. I like the rose one. They do a plain one as well. Absolutely love this."
ALL-TIME SKINCARE FAVOURITES - Longtime Favourites
"This has been in my collection for four, five years, definitely since I started experimenting with Korean skincare. This was one of the first Korean skincare products I bought, never looked back. Phenomenal. It's the exact dupe for that bougie SK-II Essence that's like 150 dollars, this is 10 pounds. It's packed full of Galacoside ferment, so it hydrates and it's going to even out your skin tone. I'm not a big fan of toners, I don't like the texture as much as I like serums. I'd rather pack my routine with serums. Toners are an afterthought. However, this is the one toner I really make an exception for. I would use this every single day and I very rarely miss it. It hydrates, it plumps you up. You could even put this in a spray bottle in summer, keep it in the fridge, and then just mist throughout the day for a bit of cooling and a little extra hydration."
BESTSELLING KOREAN SKINCARE 2023 - Part 2
"I apply just a little across the skin before my serum steps. After you've cleansed, just use a little of this to dampen up the skin, put your serums on and all those serums are going to deliver a little extra. You get more bang for your buck. For the price point, I think this is worthy of addition in any top 10 list. I just think it's absolutely wonderful and a holy grail for sure."
BESTSELLING KOREAN SKINCARE 2024 - What We All Bought
"My favorite of the two is the Secret Key Starting Treatment Essence. This contains lactic acid, which is going to be one of the hottest ingredients in skincare this year. It's great because it hydrates but it also calms skin and fades hyperpigmentation. So if you're someone that's seen that celebrity endorsed SK-II essence, you know the one that's like $200, and you want an exact dupe, this is it. It hydrates you to the gods, fades your hyperpigmentation, plumps out the skin. This one's everything, one of my absolute favorites."
INSTANT ANTI AGING SERUMS - 10 Years Younger Instantly
"If you want to go for a slightly fancier option something in the Korean skincare market, this is the Secret Key Starting Treatment Essence. It works with galactomyces ferments. It will add some hydration, some moisture that those humectants can grab on to, but it also has a nice range of different ingredients to calm and soothe. This is a great all-rounder. This is great if you've got particularly sensitive skin. I use this every day without fail and I love it. Quick spritz on in the morning, going with your hydrating serum afterwards, and you'll see instant results. It's super affordable, so I would genuinely say this is a sort of product that everyone should have in their skincare collection. Affordable, works really well."
IT'S OVER FOR TONERS - What Happened To The Ordinary Glycolic Acid Toner
"The Secret Key Starting Treatment Essence is a toner that's great for fading hyperpigmentation and hydrating the skin. It contains galactomyces ferment which is great for adding some additional hydration but at the margins also supporting with the eradication of excess pigment. If you're someone who is trying to fade their hyperpigmentation this is a great toner to slot in alongside your other actives. It's a great option if you're looking to shop drugstore and affordable but want a little extra boost to your hyperpigmentation fighting and some extra hydration. I absolutely adore this one."
ALL-TIME GREATEST KOREAN SKINCARE PRODUCT - 30% Fewer Wrinkles Fast
"This is the Secret Key starting treatment essence. This is a product that I go back to time and time again. I first tried it four years ago and I thought nothing special. I finished a bottle and thought, I can actually see results. I think this is helping with my hyperpigmentation. My skin is less dry because I started using it in the cooler winter months when my skin is very dry. It was less dry. It was less sensitive. And so I got another bottle and ever since then I've never been without it. I think it's just one of those products that maybe doesn't wow on first application but your skin suddenly learns to love it and you're just like actually this is my skincare best friend and I don't think I've been without it for the past four years. It is genuinely stunning. Really inexpensive. The last time I bought it, one lasts forever as well. So I buy one every six months. I think I paid £14. It's glass, so it feels bougie and luxury. It's got galactomyces in here, which are going to help even out the skin tone and help you with hyperpigmentation, which I love. It's also super hydrating. They do a rose version and a plain version. I like the rose one. It's uplifting, smells gorgeous."
Approved
"The galactomyces in here will absolutely improve tone and texture on the skin. It might take a little bit longer to see those types of results, but that is why you're going to see with a lot of the galactomyces based products some other helper ingredients that kind of lift it up within the formula. An additional brightener that's added into this product is arbutin, which is a really effective ingredient for dark marks on the skin. If you have hyperpigmentation, if you're really trying to fade those spots, arbutin can be a really nice accelerator to fading those spots. It's a fantastic brightening ingredient. The formula of Secret Key has changed slightly since I did a previous video on galactomyces products, and the little bit of criticism that I gave it a couple of years ago actually doesn't stand anymore. The one ingredient I didn't really love in this they actually took out, and I find the texture even more hydrating and pleasant than it was before."
You might also like

Similar products worth a look.

Other products the same gurus have weighed in on, plus more from this brand and category.

This week's top beauty news, in your inbox.

A weekly read of the takes worth catching up on: the raves, the splits, the ones the gurus won't shut up about. Free, no spam, unsubscribe whenever.

Subscribe to the digest