Sum37
Su:m37 builds its skincare on natural fermentation. The brand ages batches of botanical extract for months before they reach a bottle, and that slow process gives the line its signature rich feel. We list the full range here. There is the Secret Essence that made the brand famous, the Deeromme toner and emulsion duo for daily hydration, and the Microactive serums for targeted steps. Sun care, the moisturizing emulsions, and the Waterpool CC base fill in the rest, so you can build a routine from cleanse to finish on one shelf.
By Skinsli editorial Updated
Buying guide
How to choose Su:m37 skincare
Su:m37 is a fermented skincare brand, and fermentation shapes almost everything it sells. Extracts sit and age before they go into a formula, which is why the textures lean rich and the essences feel concentrated. This guide walks through the lines we stock, what each one does, and how to pick the pieces that fit your own routine.
What fermentation does for the formula
The brand ages its botanical extracts before bottling them, the same idea behind fermented foods. The process breaks larger molecules into smaller ones that skin takes up more readily, and it concentrates the active content of the original plant. In practice that shows up as essences and emulsions that feel denser than their water-based equivalents and that you can use in smaller amounts. If you have tried a galactomyces or rice-ferment product and liked it, Su:m37 sits in the same family with its own house process behind it.
Start with the Secret Essence
The Secret Essence 150ml is the product that built the brand, and it is the natural first buy for anyone new to the line. It goes on right after cleansing, before the rest of your steps, and acts as a fermented first treatment. The 150ml size lasts a while because you only need a few drops pressed into damp skin. If you want to know what Su:m37 is about before you commit to a full routine, this is the bottle to judge it by.
The Deeromme toner and emulsion duo
Deeromme is the everyday hydrating pair: the Perfect Toner 130ml and the Perfect Emulsion 110ml. The toner preps and softens skin after cleansing, and the emulsion seals in moisture as a lightweight lotion step. Run them in that order, toner then emulsion, and they cover the basic hydrate-and-lock part of a routine without a heavy cream. They suit people who want a simple daily base and plan to add serums or essences on top.
Microactive serums for targeted steps
The Microactive line is where the brand puts its more active treatments. We carry the Microactive Repair Serum 50ml for a concentrated nightly or twice-daily treatment, and the Microactive Sun Serum 50ml for daytime protection that doubles as a serum. Serums go on after your essence and before your emulsion or cream, so the Repair Serum slots into the middle of a routine. Reach for this line once you have the hydration basics down and want to address a specific concern.
Emulsions and moisture for the lock-in step
Beyond Deeromme, the catalog includes the Permentarift Moisturizing Emulsion 130ml and the Fler Regenerative Emulsion 130ml. Emulsions are the brand's take on a moisturizer: lighter than a cream but still rich enough to finish a routine, which suits the warmer-climate preference for layers over one heavy product. Pick the Moisturizing Emulsion for straightforward daily hydration and the Regenerative Emulsion when you want something with more of an anti-aging slant. Either one goes on as the last leave-on step before sunscreen.
Sun care that fits the routine
Su:m37 keeps daytime protection in step with the rest of the line. The Sunaway Airfit Sunquid 50ml is a fluid sunscreen with a light finish that wears well under makeup, and the Microactive Sun Serum 50ml gives you protection in a serum format if you prefer fewer layers. Sunscreen is always the final morning step, applied after your emulsion. Having a brand-matched option means you can keep the same fermented base from essence through to SPF.
Where the Waterpool base fits
The line crosses into base makeup with the Waterpool CC Foundation 45ml. A CC formula evens tone and adds light coverage while keeping a skincare-forward, dewy finish, so it sits between a treatment and full foundation. It goes on after sunscreen as the start of your makeup, not part of the skincare steps. For someone who wants their complexion product to match the hydrating character of the rest of the brand, it closes the loop from essence to finished face.
Time Energy and the premium sets
At the top of the range sit the Time Energy sets, the brand's premium anti-aging tier sold as multi-piece kits. A set bundles matched steps so the products are formulated to work together, which makes them a tidy way to gift the line or to upgrade a whole routine at once rather than piece by piece. They carry the brand's most intensive fermented formulas. Treat these as the splurge end of the catalog once you know the lighter lines already agree with your skin.
Putting a Su:m37 routine in order
A full day with the brand runs cleanse, then Secret Essence, then a Microactive serum, then a Deeromme or other emulsion, and sunscreen to finish in the morning. You do not need every line at once. Most people start with the Secret Essence plus one emulsion, then add a serum or sun product as they go. Because the formulas share the same fermented base, the lines layer cleanly, so you can grow the routine without worrying about clashing textures.
FAQ
Frequently asked questions
FAQ
Frequently asked questions
What is the Su:m37 Secret Essence and why is it the brand's signature?
The Secret Essence is Su:m37's flagship fermented first-treatment essence and the product the brand is best known for. It is made from botanical extracts that age before bottling, which is the natural fermentation the whole line is built on. You apply a few drops right after cleansing, before toner or serum, and it preps skin for the steps that follow. The 150ml bottle we list is the size most people buy as their entry point into the brand.
What does "fermented" mean for Su:m37 skincare?
Su:m37 ages its plant extracts over time before they go into a formula, the same principle behind fermented foods. The process breaks down larger molecules so skin can absorb them more easily and concentrates the actives from the original botanicals. That is why the essences and emulsions feel richer than plain water-based products and why a little goes a long way. If you already get on with galactomyces or rice-ferment essences, this brand sits in the same category.
What is the difference between the Deeromme and Microactive lines?
Deeromme is the everyday hydrating duo: the Perfect Toner and Perfect Emulsion that cover the prep and moisture-lock steps for daily use. Microactive is the more active tier, with the Repair Serum for a concentrated treatment and the Sun Serum for daytime protection. In short, Deeromme builds your base and Microactive adds targeted steps on top. Most people start with the Deeromme pair and add a Microactive serum once the basics are in place.
In what order do I layer the Su:m37 essence, toner, serum and emulsion?
Work from the thinnest texture to the richest. Cleanse first, then press in the Secret Essence, follow with the Deeromme Perfect Toner, add a Microactive serum, and seal with an emulsion such as the Deeromme Perfect Emulsion or the Fler Regenerative Emulsion. In the morning, finish with the Sunaway sunscreen as the last step. You do not need all of these at once; the order just tells you where each piece goes when you add it.
Su:m37 sells emulsions instead of a thick cream. Is that enough moisture?
An emulsion is the brand's moisturizer step, lighter than a Western-style cream but still rich enough to finish a routine. Korean routines tend to favor layering lighter products over one heavy cream, and the Permentarift Moisturizing Emulsion or Deeromme Perfect Emulsion are made to be that final leave-on layer. For most skin types one emulsion seals in the steps underneath. If your skin runs very dry, you can layer an emulsion over an essence and serum for more cushion.
Which Su:m37 sunscreen should I pick, the Sunaway Sunquid or the Microactive Sun Serum?
The Sunaway Airfit Sunquid is a fluid sunscreen with a light finish that sits well under makeup, so it suits anyone who wants a dedicated SPF step. The Microactive Sun Serum gives you sun protection in a serum format, which is handy if you prefer fewer layers in the morning. Both are the brand's daytime answer and both go on as the final morning step. Choose the Sunquid for a classic sunscreen feel and the Sun Serum to combine protection with a treatment.
Are the Su:m37 Time Energy sets worth it?
Time Energy is the brand's premium anti-aging tier, sold as multi-piece sets of matched steps. Because the pieces are formulated to work together, a set is a clean way to upgrade a whole routine at once or to give the line as a gift, rather than buying step by step. They carry the brand's most intensive fermented formulas, which is reflected in the price. They make the most sense once you already know the lighter Su:m37 lines agree with your skin.
Are these genuine Korean Su:m37 products?
Yes. We list authentic Su:m37 stock sourced from Korea, including the Secret Essence, the Deeromme and Microactive lines, sun care and the Time Energy sets. Su:m37 is a Korean fermented-skincare brand, and the range here is the real catalog rather than reformulated export versions. If you want to start with the piece that defines the brand, the Secret Essence is the one to judge it by.