Anyone who has ever held a jar of expensive cream and thought, "What if I could make it better?" is already standing on the threshold of cosmetic chemistry. Creating a moisturizing cream yourself is not just about mixing oil and water. Behind the right texture, a lasting feeling of comfort on the skin, and a real moisturizing effect lies the precise selection of ingredients, an understanding of their functions, and knowledge of how they interact with each other. In this article, the Oksana Walker online school breaks down hydration from a chemical perspective — from molecular mechanisms to practical formulation — so that you can formulate consciously, rather than by trial and error.
Three mechanisms of hydration: humectants, emollients, and occlusives
Before moving on to the formula, it is important to understand that "hydration" is not a single action, but three different mechanisms working at different levels of the skin. A professional formulator builds a formula to utilize all three layers of the moisturizing system.
Humectants: attracting water from the air
Humectants are hygroscopic substances that bind water molecules from the environment and hold them in the upper layers of the epidermis. They work like molecular sponges. Classic examples include:
- Glycerin — the most accessible and well-studied humectant, with a working concentration of 3–8%. If it exceeds 10% in anhydrous conditions, it can have the opposite effect — drawing moisture out of the deeper layers of the skin.
- Sodium hyaluronate — high molecular weight (retains moisture on the surface) and low molecular weight (penetrates deeper). Use them in pairs at 0.05–0.2% each.
- Betaine — a mild osmoprotectant, well-tolerated by sensitive skin, concentration 1–3%.
- Panthenol (provitamin B5) — combines humectant and regenerative action, 1–5%.
- Erythritol and trehalose — sugar humectants with additional antioxidant activity.
Emollients: restoring the barrier and creating texture
Emollients fill the intercellular spaces of the stratum corneum, making the skin soft and smooth to the touch. They are what primarily determine the texture of the cream — light or rich, matte or radiant. Choosing an emollient is both a technological and an aesthetic decision. Read more about how to select oils for a specific skin type in the article How to choose oils and butters for your skin type: a guide for beginner formulators.
Occlusives: sealing moisture inside
Occlusives create a thin film on the skin's surface that slows down transepidermal water loss (TEWL). Classic occlusives include petrolatum, waxes, dimethicone, and squalane. Important: an occlusive without a humectant will simply seal in what is already there — if the skin is dehydrated, the effect will be minimal. Therefore, a well-designed cream formula always combines both mechanisms.
How to create a moisturizing cream yourself: basic formula architecture
Any oil-in-water (O/W) emulsion — which is the type most commonly used in daily moisturizing creams — is built according to a universal scheme. Understanding this architecture allows you not just to copy other people's recipes, but to create your own.
Water phase (60–80%)
The base of the water phase is distilled or deionized water. This is where humectants (glycerin, sodium hyaluronate, panthenol), water-soluble actives (niacinamide, allantoin, extracts), and hydrophilic thickeners (xanthan gum, carbomer) are dissolved. You can read more about how thickeners work and their synergy in our article Xanthan and guar gums: comparison, synergy, and the unexpected winner.
Oil phase (15–30%)
This is where emollients and occlusives are concentrated: oils, butters, waxes, and oil-soluble actives (vitamin E, retinol, CoQ10). The ratio of light to heavy oils determines the final skin feel. Light oils (squalane or linoleic types) provide quick absorption; heavy ones (shea butter, castor oil) provide rich nourishment and occlusion.
Emulsifier: the heart of a stable emulsion
Without an emulsifier, oil and water will not form a stable system. For formulating at home, the most commonly used are:
- Olivem 1000 (cetearyl olivate / sorbitan olivate) — a natural emulsifier, highly compatible with actives, providing a creamy texture.
- Montanov 68 (cetearyl glucoside) — stabilizes a wide range of oil phases, suitable for oily skin types.
- Polawax / Emulsifying Wax NF — a reliable synthetic emulsifier that is forgiving of beginner mistakes.
- BTMS-50 — a cationic emulsifier that provides a silky glide, popular in body lotions.
The working concentration for most emulsifiers is 4–8% of the total mass of the cream formula. It is critically important to maintain the pH in cosmetics: most emulsions are stable at a pH of 5.0–6.5, which coincides with the natural pH of the skin.
Choosing active ingredients for a moisturizing effect
Actives are what distinguish a "simple cream" from a "functional cream." In the context of hydration, several groups of compounds are considered the most studied and effective.
Ceramides and intercellular lipid analogs
Ceramides make up about 50% of the lipid matrix of the stratum corneum. When they are deficient, the barrier is compromised, TEWL increases, and the skin becomes dry and reactive. Synthetic analogs (ceramide NP, AP, EOP) are added to the cream formula in a concentration of 0.5–2% into the oil phase or in the form of ready-made complexes. To enhance the effect, they are combined with cholesterol and free fatty acids in a 3:1:1 ratio.
Niacinamide: a multifunctional active
Niacinamide (vitamin B3) at a concentration of 2–5% stimulates ceramide synthesis, reduces TEWL, and evens out skin tone. It dissolves in the water phase at temperatures up to 40°C. An important nuance: when used together with high concentrations of vitamin C (ascorbic acid), the formation of niacin is possible, a substance that causes redness. The optimal pH for niacinamide is 5.5–7.0.
Peptides and matrikines
Peptides work at the dermal level, stimulating the synthesis of collagen and hyaluronic acid. A detailed analysis of their mechanism of action and the rules for incorporating them into a cream formula can be found in the article on peptides for facial skin in cream. The key rule: peptides are added to the cool-down phase at a temperature below 40°C, otherwise they will denature.
Texture and rheology: why a cream should not only hydrate but also be pleasant to use
Even a cream formula that is perfectly balanced in terms of actives will fail if the texture is uncomfortable. Rheology—the science of the flow and deformation of materials—is directly applicable to cosmetics. Tactile sensations during application (spread, finish, absorption time) largely determine whether a person will use the product regularly. And only regular use provides a real cosmetic result.
Controlling viscosity and spreading
The viscosity of an emulsion is regulated by several tools:
- Type and concentration of the emulsifier (BTMS provides a denser texture than Olivem 1000 at the same concentration).
- Co-emulsifiers and oil-phase thickeners: cetyl alcohol, behenyl alcohol, waxes.
- Hydrophilic water-phase thickeners: carbomer (neutralized to pH 6–7), hydroxyethylcellulose, xanthan gum.
- Ratio of oil and water phases: the higher the proportion of oils, the richer the cream.
How thickeners affect slip and tactile characteristics is described in detail in the section on tribology, gums, and gelling agents—we recommend studying it before adjusting the texture of a finished emulsion.
Silicones and their natural alternatives
Dimethicone and cyclopentasiloxane are traditionally used to create a silky finish and reduce TEWL. If you are working in the natural segment, they are replaced with isostearyl isostearate, plant-derived caprylyl methicone, or a combination of light oils (jojoba oil + squalane type). Natural alternatives provide a similar spread but require more careful balancing of the oil phase.
Preservation and stability: the cream must be safe
A water-containing emulsion is an ideal environment for the growth of microorganisms. Preservation is not an option, but a mandatory element of any moisturizing cream. The choice of preservative depends on the pH of the formula, compatibility with actives, and "naturalness" requirements.
Popular preservation systems
- Phenonip (phenoxyethanol + parabens) — broad spectrum, pH 3–8, 0.5–1%.
- Euxyl PE 9010 (phenoxyethanol + ethylhexylglycerin) — paraben-free, pH 3–8, 0.5–1%.
- Leucidal Liquid SF (lactobacillus) — natural option, effective at pH 3.5–5.5, requires boosting.
- Geogard Ultra (gluconolactone + sodium benzoate) — certified as natural, pH up to 5.5.
Preservative efficacy testing is carried out via a Challenge Test (microbiological stability test). At home, the minimum control is visual assessment and organoleptic evaluation after 4–8 weeks of storage at different temperatures. Read more about home stability tests in our article on formula stability.
Example of a basic moisturizing cream formula
Below is a starting point for your experiments. The formula is calculated for 100 g of finished product, O/W emulsion type, suitable for normal and combination skin.
Water phase (heat to 75°C):
- Distilled water — 68%
- Glycerin — 5%
- Panthenol — 2%
- Allantoin — 0.2%
Oil phase (heat to 75°C):
- Olivem 1000 — 6%
- Cetyl alcohol — 2%
- Jojoba oil — 7%
- Shea butter — 4%
- Tocopherol (vitamin E) — 0.5%
Cool-down phase (add at T below 40°C):
- Sodium hyaluronate (1% solution) — 4%
- Niacinamide — 3%
- Euxyl PE 9010 — 0.8%
- Fragrance / essential oil — up to 0.5%
The pH of the finished emulsion is adjusted with lactic acid (10% solution) to 5.0–5.5. If you want to learn how climate affects the behavior of oils in this formula — for example, why shea butter behaves differently in summer and winter — we recommend our article on how climate affects the composition of fatty acids and essential oils in plants.
When creating a moisturizing cream yourself, it is important to understand that every change in the formulation — replacing an oil, using a different emulsifier, or adding a new active ingredient — triggers a chain of consequences for texture, stability, and efficacy. This is precisely why a professional approach involves changing one variable at a time, followed by mandatory testing of the result.
Frequently Asked Questions
Can I replace distilled water with a hydrosol in a cream formula?
Yes, a hydrosol is an excellent substitute for water: it introduces additional active components (terpenes, organic acids) and improves the scent. However, hydrosols have their own pH and may contain natural microorganisms, so you must monitor the pH of the finished emulsion and ensure that your preservation system covers the additional microbial load. It is recommended to use certified cosmetic hydrosols rather than food-grade ones.
Why does the cream separate a few days after preparation?
Separation is a sign of an unstable emulsion. Causes include: insufficient emulsifier concentration, incorrect temperature during phase mixing (both phases should be heated to the same temperature — usually 70–75°C), cooling too quickly, ingredient incompatibility, or an incorrect pH. Also, check the HLB value of your emulsifier: it must correspond to the ratio of the oil and water phases in the formula.
How long does a homemade moisturizing cream last?
With proper preservation and adherence to production hygiene (sterilized tools and containers, working in clean conditions), the shelf life is 3–6 months at room temperature. Using a pump dispenser instead of an open jar significantly reduces contamination. Storing it in the refrigerator extends the shelf life but may change the texture of creams based on waxes and butters — read more about butter crystallization in our article on butter polymorphism.
Cosmetic chemistry is a discipline where intuition only works when paired with theory. The deeper you understand the function of each ingredient, the more predictable the result and the fewer ruined batches you will have. If you want to move from experimentation to systematic knowledge, the Walker Formulation Academy Club is a community of practising formulators with access to formula breakdowns, a library of formulas, and expert support. Learn more in our courses and start formulating with an understanding of every gram in your recipe.
