Serum, ampoule, essence, toner, emulsion, lotion, cream, gel cream, balm, face oil and sleeping mask are marketing names for textures, not legal categories: no regulator defines them, and the same rules apply to all of them as cosmetics. In practice a toner and an essence are thin water-based liquids, a serum is a slightly thicker treatment liquid or gel, an ampoule is a small, concentrated serum, lotions and creams are emulsions of oil and water (lighter to richer), a gel cream is a water gel with little oil, a balm and a face oil contain no water, and a sleeping mask is a rich leave-on layer for night. Choose the texture from the skin type and climate you sell to, then brief the manufacturer with sensory words (absorption, slip, stickiness, finish) rather than only a product name.
Marketing words, not legal categories
No law defines "serum", "ampoule" or "essence". In the US, a cosmetic is anything applied to the body to cleanse, beautify or change the appearance, and the old FDA product category list used for registration groups skin care into broad buckets such as "cleansing", "face and neck", "moisturizing", "night" and "paste masks". The words serum, ampoule and essence do not appear there. In the EU, the Cosmetics Regulation defines a cosmetic by where it is applied and what it is for, not by its texture. Health Canada's notification form asks for the product's "form", such as cream, gel or powder, as a description, not as a legal class.
Two things follow for a founder:
- You can name the texture what you like, as long as the name is not misleading. A thin liquid sold as a "cream" would be.
- Texture never changes the rules. What can turn a product into a drug is the claim and the active ingredient, not the format. An "acne serum" with salicylic acid is an over-the-counter drug in the US because of the acne claim, whatever its texture. See cosmetic vs drug claims.
Every format at a glance
The table shows how manufacturers usually build each format. Real products overlap: one brand's essence is thicker than another brand's serum. Treat the columns as starting points for your brief.
| Format | Usual base | Feel and flow | Typical job | Common container |
|---|---|---|---|---|
| Toner | Water solution, sometimes with a little oil or a milky dispersion | Water-thin, pours | Rebalance after cleansing, first hydration, light exfoliation | Bottle with disc cap, pads in a jar, mist |
| Essence | Water solution or very light gel, often ferment or snail based in K-beauty | Thin to slightly slippery | Light hydration and treatment between toner and serum | Bottle with cap or pump, dropper |
| Serum | Water gel, light emulsion or oil, carrying the main actives | Light, spreads easily, sinks in | Targeted treatment: brightening, firming, hydration, pores | Dropper bottle, pump, airless pump |
| Ampoule | Same bases as a serum, fewer ingredients at higher levels | Like a serum, often a little thicker | Short, intensive course or the most concentrated step | Small dropper bottle, crimp-sealed glass vials, single-dose packs |
| Emulsion (K-beauty) or lotion | Oil-in-water emulsion with a low oil phase | Milky, pourable or pumpable | Daily moisturizer for normal, oily or humid-climate skin | Pump bottle, tube |
| Gel cream | Water gel with little or no oil, sometimes a light emulsion | Bouncy, cooling, absorbs fast | Moisturizer for oily and combination skin, hot climates | Jar, tube, airless |
| Cream | Oil-in-water emulsion, or water-in-oil for very rich creams | Thick, spoonable, cushiony | Moisture and barrier support, night care, dry skin | Jar, airless, tube |
| Balm | Anhydrous: oils, butters and waxes, no water | Solid that melts on skin | Very dry patches, cleansing balm, multi-use stick | Jar, tin, stick |
| Face oil | Anhydrous blend of plant oils, esters or squalane | Liquid, glides, can leave a sheen | Seal in moisture, add glow, last step at night | Glass dropper, small pump |
| Sleeping mask | Rich gel or cream, often with a film-forming layer | Thick, stays on overnight | Last step at night, left on until morning | Jar, tube, airless |
The four bases: O/W, W/O, water gel, anhydrous
Almost every leave-on skincare product sits on one of four bases. Knowing which one you want makes your brief clearer and explains most of the price and stability differences.
- Oil-in-water (O/W) emulsion
Small oil droplets spread through water, held together by emulsifiers. Water is the outer phase, so the product feels light and fresh, rinses off easily and is easy to layer. Most lotions, emulsions, creams and many serums are O/W. It needs a preservative system because water supports microbes.
- Water-in-oil (W/O) emulsion
Water droplets inside oil. Oil is the outer phase, so the product feels richer, more occlusive and more water resistant. Used for barrier creams, cold-climate creams and some sunscreens. Harder to make stable, and it can feel heavy in heat.
- Water gel
Water thickened with gelling agents (polymers such as carbomer, xanthan or other gums), with little or no oil. This is the base of most gel creams, many serums and essences. It feels cooling, absorbs fast and suits oily skin. It also needs a preservative system, and very high levels of salts or acids can thin some gels, which is why the chemist picks the thickener to match the actives.
- Anhydrous (no water)
Oils, butters, waxes and esters only: face oils, balms, cleansing oils and balms. Microbes need water to grow, so the microbial risk is lower, but oils can oxidize and go rancid, so antioxidants and the right container matter. A safety assessor still decides whether a challenge test is needed.
Some textures are hybrids: a "milky toner" is a very dilute emulsion, a "water cream" is a gel with a small oil phase, and many sleeping masks combine a gel with a film former that stays on the skin overnight.
Each format in detail
Toner
The first leave-on step after cleansing. Western toners were often alcohol based astringents; Korean toners are usually hydrating, with humectants such as glycerin, panthenol or hyaluronic acid, and sometimes acids for gentle exfoliation (for which pH matters; see AHA, BHA and PHA). Toners are mostly water, so the fill cost per mL is low and the container is a large share of the unit cost. Toner pads (cotton or nonwoven pads soaked in toner, sold in a jar) are a popular format. More on the private label toner page.
Essence
An essence sits between a toner and a serum: thin like a toner, but with more conditioning and treatment ingredients. In K-beauty the classic essences are yeast ferment filtrates, snail secretion filtrate and rice ferments. It is easy to explain to new customers and is often a good first product. See private label essence.
Serum
The treatment step. A serum carries the active you build the brand around, such as niacinamide, vitamin C, peptides, retinal or PDRN, in a light base that spreads and absorbs quickly. Serums are where packaging and stability matter most, because many actives react with air, light or each other. Read active ingredients and use levels and the private label serum page.
Ampoule
In Korea an ampoule means a smaller, more concentrated serum, often sold as a course: a set of glass vials or a small dropper for 1 to 4 weeks of use. The name comes from medical glass ampoules, which is why sealed vials and a clinical look are common. There is no rule for how concentrated an ampoule must be, so the difference from a serum is your positioning and formula, not a legal one. See private label ampoule.
Emulsion and lotion
A light O/W emulsion. In Korea, "emulsion" (often sold as the step after toner) means a milky, light moisturizer; in the US the same product is usually called a lotion. Pump bottles and tubes suit it. Body lotion is the same idea with a larger fill and a simpler formula. See private label moisturizer and body care.
Gel cream
A water gel, sometimes with a small oil phase, that looks like a cream in the jar but feels cool and light. Korean "water creams" and "aqua gels" are gel creams. Best for oily and combination skin, humid climates and summer launches.
Cream
A richer emulsion with more oils, butters and fatty alcohols. Barrier creams with ceramides, cica creams and night creams belong here. Rich creams can be W/O. Creams take longer to make than liquids because the oil and water phases are heated and homogenized, and thick products fill more slowly.
Balm
A water-free blend of oils, butters and waxes that is solid in the jar and melts on the skin. Used for very dry areas, multi-balm sticks and cleansing balms that turn milky with water. Balms need temperature control in filling and can soften or grain in hot shipping, so stability at high temperatures matters.
Face oil
A blend of plant oils (jojoba, rosehip, camellia), esters or squalane. Face oils feel rich without water and give glow. Choose oils that resist oxidation, add an antioxidant such as tocopherol, and use a dark glass bottle. If the oil contains 10% or more hydrocarbons (for example mineral oil) and is thin and not an emulsion, US rules can require child-resistant packaging; see the packaging section below.
Sleeping mask
A leave-on mask used as the last step at night and left on until morning, often called a "sleeping pack" in Korea. It is usually a rich gel or cream with humectants and a light film former, so it does not rub off on the pillow. Different from wash-off masks such as clay masks, which are rinsed after 10 to 15 minutes.
How K-beauty uses the words
Korean brands sell to customers who layer several thin products, from the thinnest to the thickest. That is why the market has more texture names than most. A few words that confuse buyers abroad:
| Korean usage | What it means | Closest English word |
|---|---|---|
| "Skin" (스킨) | The toner step | Toner |
| "Lotion" or "emulsion" (로션, 에멀전) | A light, milky moisturizer used after toner and serum | Lotion, light moisturizer |
| "First essence" | A watery essence used right after cleansing or toner | Treatment toner |
| Ampoule (앰플) | The most concentrated treatment step | Concentrated serum, booster |
| "Water cream" (수분크림) | A gel cream | Gel cream, gel moisturizer |
| "Sleeping pack" (슬리핑팩) | An overnight leave-on mask | Sleeping mask, overnight mask |
| "Booster" | A thin product used before others to "prep" the skin | Pre-serum, primer serum |
If you sell abroad, use the word your customers search for. A US shopper searches for "gel moisturizer" more readily than "water cream", while K-beauty fans know "ampoule" and "essence". You can combine both on the pack: "Hydrating Water Cream, gel moisturizer".
What drives the cost of a texture
The texture name does not set the price; the formula, the process and the container do. The main drivers:
- Active ingredients and their level. A serum with 5% of an expensive active costs more than a toner of mostly water. Ampoules usually cost more per mL for the same reason.
- Oil phase and emulsifiers. Creams with butters, ceramides and special emulsifiers cost more per kilogram than a water gel.
- Process time. Emulsions are heated, mixed and homogenized and then cooled; gels and solutions are simpler. Anhydrous balms need heated filling.
- Filling speed. Thick creams and balms fill more slowly than liquids, and small fills (5 mL vials, 15 mL ampoules) cost more per mL than large fills.
- Container. A stock PET bottle with a cap is the cheapest option; glass droppers, airless pumps and crimp-sealed vials cost more. At KoreanOEM a stock container and a one-color printed label are included in the unit price.
- Order size. The minimum and the price break with quantity. At KoreanOEM a ready library serum starts at about USD
3.40 per unit at500 units, a cream at about USD3.41 at500 units and a toner at about USD2.89 at1,000 units. Against the 500-unit price, units cost about 20% less at 1,000, 35% less at 3,000 and 40% less at 10,000. See all products and prices.
Which packaging fits which texture
The container has to dispense the texture well and protect the formula. A pump that cannot move a thick cream, or a dropper that drips a thin toner, ruins the product in daily use.
| Texture | Works well | Watch out for |
|---|---|---|
| Toner, essence, mist | Bottle with a disc or flip cap, fine mist sprayer, pump for thicker essences | Droppers drip thin liquids; mists need a fine, even spray |
| Serum | Glass dropper, lotion pump, airless pump for vitamin C, retinal or other sensitive actives | Clear glass and a large headspace speed up oxidation of sensitive actives |
| Ampoule | Small dropper bottle, crimp-sealed vials, single-dose packs | Vials need an opening method customers understand |
| Lotion, emulsion | Pump bottle, tube | Jars invite fingers and air into a pourable product |
| Gel cream, cream | Jar with inner lid, airless jar or pump, tube | Very thick creams can block standard pumps; ask for a pump test |
| Balm | Jar, tin, twist-up stick | Melting in summer shipping; test at high temperature |
| Face oil | Amber or frosted glass dropper, small pump | Oils can attack some plastics and rubber teats; check compatibility |
| Sleeping mask | Jar with spatula, tube, airless | Jar formulas need a preservative system proven by a challenge test |
Compatibility matters as much as looks: the formula must not leak, discolor the container, or lose weight through the wall. That is checked in a stability and compatibility test. For the trade-offs between pumps and droppers, read airless vs dropper packaging; for container styles, see packaging and custom container sourcing.
Choosing texture for climate and skin type
Pick the texture from where and on whom the product will be used, not only from what is trending. A rich cream that sells in a Canadian winter can feel greasy in Singapore humidity.
- Write down the climate of your main market
Hot and humid (Southeast Asia, the Gulf in summer, the US South): customers want gels, water creams, light lotions and fast absorption. Cold and dry (Northern Europe, Canada, northern US winters): creams, barrier creams, balms and W/O textures sell better. Many brands launch a light and a rich version of the same moisturizer.
- Match the skin type you target
Oily and acne-prone: water gels, light serums, low oil phase, non-sticky finish. Dry: creams, ceramides, oils, occlusive finish. Combination: gel creams. Sensitive: short ingredient lists, no added fragrance, gentle pH; see fragrance-free and sensitive-skin formulating. Mature: richer creams and serums, often with peptides or retinal.
- Decide where it sits in the routine
If the product is a step in a layered routine, it should be lighter than what comes after it and should not pill (roll into little flakes) under sunscreen or makeup. If it is a one-step product, it needs enough richness on its own.
- Check the actives against the base
Some actives need a specific base: pure vitamin C is happiest in water at low pH or in anhydrous systems; retinal needs protection from light and air; high niacinamide is easiest in a water gel. Ask the chemist what base the active needs before you fix the texture.
- Order samples of two or three textures
Order a sample box with 2 or 3 versions, test them in your market's climate for at least a week, and give feedback in sensory words (next section).
Sensory words for your brief
"Make it like a serum" means different things to different people. Chemists and sensory panels describe skin products with specific attributes before, during and after application; ASTM International publishes a guide for this (ASTM E1490 for skin creams and lotions). Use the same words in your product brief and in your sample feedback.
| Attribute | What it describes | Example wording |
|---|---|---|
| Appearance | Clear, translucent, milky, opaque, pearly; color | "Clear and colorless, no visible particles" |
| Viscosity, flow | How it pours or holds shape | "Pours slowly, holds a drop on the fingertip" |
| Spreadability, slip | How easily it moves across skin | "Spreads in two strokes, silky slip" |
| Playtime | How long it stays workable before it sets | "Short playtime, absorbs within 30 seconds" |
| Absorption | How fast it disappears into skin | "Fast, no white cast left" |
| Tack | Stickiness while drying and after | "No tack after one minute" |
| After-feel, residue | What the skin feels like after | "Soft, hydrated, not greasy, no film" |
| Finish | How the skin looks after | "Dewy but not shiny" or "matte, velvety" |
| Cooling or cushion | Feel on application | "Cooling gel that breaks into water" |
| Scent | Fragrance or base odor | "No added fragrance, minimal base odor" |
| Layering | Behavior under other products | "Must not pill under SPF or foundation" |
- Choosing the texture from a trend or a competitor's name instead of the customer's climate and skin type.
- Writing "serum texture" in the brief without sensory words, then rejecting samples that match the brief.
- Putting a pourable lotion or a vitamin C serum in an open jar.
- Using a dropper for a water-thin toner, or a standard pump for a very thick cream, without a dispensing test.
- Thinking an "ampoule" must legally contain more active than a "serum", or that the word "essence" changes the rules.
- Shipping balms and W/O creams through hot climates without checking stability at high temperature.
- Ignoring the US child-resistant packaging rule for thin, hydrocarbon-rich oils.
- Testing samples for one day; textures that feel good on day one can pill, feel sticky or dry the skin after a week.
- I know the main climate and skin type of my customers.
- I chose a base: O/W, W/O, water gel or anhydrous.
- I know where the product sits in the routine and what goes on top of it.
- My chemist confirmed the base suits my hero active.
- My brief describes appearance, flow, absorption, tack, finish, scent and layering.
- I picked a container type that dispenses this texture and protects the actives.
- I checked whether a face oil or baby oil needs child-resistant packaging in the US.
- I ordered 2 or 3 texture samples and tested each for at least a week.
- I gave sample feedback with the same sensory words as the brief.
- I use the texture word my customers search for on the label and listing.
How KoreanOEM helps
KoreanOEM is a Korean skincare OEM and private label manufacturer: our formulation chemists in Busan develop your formula. Production runs in Korea at an ISO 22716 (cosmetics GMP) facility with our own staff on site. Texture is what our lab adjusts most often.
- 160+ ready formulas across serums, essences, toners, creams, gel creams, sleeping masks, oils and more in our formula library, from 500 units for serums, ampoules, essences, creams, gel creams, face oils and sleeping masks.
- Texture changes on a library base (an adjusted formula, USD 399 per SKU, from 1,000 units), or a texture matched to a product you already sell (USD 199 per SKU). Fees include first lab samples and 3 revision rounds, credited against your first production order.
- A sample box from USD 129 with up to 3 formulas of one product type, credited against your first order, so you can compare textures in your own climate.
- Stock containers (bottles, jars, tubes, pumps, droppers) and a one-color label in the unit price, or custom containers sourced to your reference with a fit and leak check.
Frequently asked questions
What is the difference between a serum and an ampoule?
What is the difference between an essence and a toner?
Is an emulsion the same as a lotion?
What is the difference between a gel cream and a cream?
Are serum, ampoule and essence legal categories?
Which texture is cheapest to manufacture?
Which moisturizer texture sells best in hot, humid countries?
Can a manufacturer change only the texture of a ready formula?
Sources
- eCFR: 21 CFR 720.4, cosmetic product categories
- FDA: Is it a cosmetic, a drug, or both? (or is it soap?)
- EUR-Lex: Regulation (EC) No 1223/2009 on cosmetic products, Article 2 (definitions)
- Health Canada: Notification of cosmetics (product form and type)
- eCFR: 16 CFR 1700.14(a)(32), child-resistant packaging for drugs and cosmetics with low-viscosity hydrocarbons
- ASTM International: E1490-19, Standard Guide for Two Sensory Descriptive Analysis Approaches for Skin Creams and Lotions
Checked against these sources in October 2026. Rules and fees change; check with the authority or your importer before you sell.