The debate between "natural" and "synthetic" in cosmetics often misses the actual benchmark. What matters is scientific evidence: Which active ingredient shows a measurable effect on the skin in controlled studies — and under what conditions? The good news: High-quality clinical data is now available for a number of bioactive substances that originally come from nature. Modern biotechnology also allows these substances to be produced with consistent purity, without relying on the over-exploitation of plant resources.

This article scientifically categorizes ten of the most thoroughly researched natural or nature-identical active ingredients. For each active ingredient, the mechanism of action, proven effects, optimal concentrations, and the status of available study data are described. The goal is not advertising, but informed orientation.

Active Ingredient Science: Why Concentration and Formulation are Key

A common misconception in communicating about skincare active ingredients is equating the mere presence of an ingredient with its efficacy. In fact, two parameters are at least as important: the concentration and the galenic formulation — i.e., the way an active ingredient is embedded in a product and thus made available to the skin.

Niacinamide, for example, can show measurable effects on barrier function at concentrations of 2%, while concentrations tested in studies for sebum regulation and pore appearance are around 5%. As a high molecular weight fraction, hyaluronic acid hardly penetrates the epidermis — but forms a valuable film on the skin's surface — while low molecular weight fractions can actually diffuse into deeper layers. Ignoring these differences means comparing incomparable things.

At the same time, the carrier system — whether an oil-in-water emulsion, anhydrous serum, liposomal formulation, or microcapsule — determines how stable an active ingredient is and how well it reaches the skin. Particularly oxidation-sensitive substances such as retinol alternatives or resveratrol require encapsulation technologies to maintain their effectiveness until application. These technological aspects are not marketing — they are the basis of reliable cosmetic formulation.

Bakuchiol and Ectoin: Plant-based Precision with Deep Action

Bakuchiol

Bakuchiol is a meroterpene phenol from the seeds of the plant Psoralea corylifolia, which has been used in Ayurvedic medicine for centuries. In recent years, it has established itself as the most scientifically researched alternative to retinol — with a crucial advantage: significantly better tolerability.

The groundbreaking randomized double-blind study by Dhaliwal et al. (2019), published in the British Journal of Dermatology, compared 0.5% bakuchiol twice daily with 0.05% retinol once daily over 12 weeks. The result: Both groups showed comparable reductions in wrinkle volume and hyperpigmentation. However, the bakuchiol group reported significantly fewer side effects such as redness, scaling, and stinging.

Mechanistically, bakuchiol acts on several levels: It stimulates retinoid receptors (RAR and RXR) without being structurally a retinoid, inhibits the expression of matrix metalloproteinases (especially MMP-1 and MMP-3), which degrade collagen, and shows antioxidant and anti-inflammatory properties. Thus, it addresses central aging processes of the skin. Bakuchiol is photostable and can also be used in the morning — another practical advantage over classic retinol.

For formulation: 0.5% bakuchiol in a suitable emollient system is the gold standard. Lower concentrations can be effectively used in combination formulas when synergistic active ingredients are present.

Ectoin

Ectoin is a cyclic amino acid originally discovered in extremophiles — microorganisms that live under extreme conditions such as high salt concentrations, UV radiation, or intense heat. These so-called halophiles produce ectoin as a protective osmolyte. The substance stabilizes proteins and membranes under stress.

Dermatological research has shown that ectoin possesses a pronounced moisture-binding capacity and stabilizes the skin barrier under oxidative and physical stress. A clinical study by Röck et al. (2018) showed that ectoin in a 0.5% formulation significantly increased skin moisture and simultaneously reduced inflammatory parameters after 28 days. Particularly relevant is ectoin's ability to mitigate UV-induced immunosuppression — a mechanism that goes beyond pure moisturizing care.

Since ectoin is unstable in plants and classic extraction would be uneconomical, it is now exclusively produced through microbial fermentation — a prime example of biotechnological efficiency, which we will discuss in the last section of this article.

Niacinamide and Panthenol: The Underestimated Regulators

Niacinamide

Niacinamide — also known as nicotinamide or vitamin B3 — is one of the most widely studied topical active ingredients in applied dermatology. The substance is water-soluble, heat-stable, and compatible with the vast majority of other active ingredients. Its spectrum of action is extraordinarily broad.

At the level of barrier function, niacinamide increases the synthesis of ceramides, free fatty acids, and cholesterol in the epidermis — the three key components of the intercellular lipid matrix. This improves the transepidermal water loss (TEWL) rate. In studies, a significant reduction in TEWL was measured with 5% niacinamide after 4 weeks.

Regarding the regulation of sebum and pore appearance, randomized studies showed that 2% and 5% niacinamide reduced both sebum secretion and perceived pore size over 8–12 weeks. For hyperpigmentation, niacinamide inhibits the transfer of melanosomes from melanocytes to keratinocytes — a different mechanism than classic brighteners like kojic acid or ascorbic acid, which makes it interesting for combination approaches.

Niacinamide also shows activity in photoprotection: It supports DNA repair after UV exposure and can mitigate the immunosuppressive effects of UV radiation. These properties make it one of the most versatile active ingredients in modern skincare — with an excellent safety profile.

Panthenol (Provitamin B5)

Panthenol is the alcohol of pantothenic acid (vitamin B5) and is oxidized to pantothenic acid after dermal application, which in turn acts as coenzyme A in numerous metabolic processes of the skin. Panthenol is an established, well-tolerated active ingredient with three main effects: moisture retention due to hygroscopic properties, strengthening of the barrier function, and support for wound healing.

In a randomized controlled study, 1% dexpanthenol (the biologically active form) significantly improved TEWL and skin hydration in dry, irritated skin after 4 weeks compared to the vehicle control. Panthenol also shows anti-inflammatory properties attributed to the inhibition of NFκB signaling pathways — a property relevant for sensitive skin and post-procedure care.

For formulations: 1–5% panthenol is stable and well-tolerated in both water-based and emollient systems. It is one of the few active ingredients widely considered suitable for sensitive and reactive skin.

Hyaluronic Acid and Ceramides: Barrier and Moisture Architecture

Hyaluronic Acid: Molecular Weight Decides

Hyaluronic acid (HA) is a linear glycosaminoglycan found in the extracellular matrix of the dermis and epidermis. It is one of the strongest endogenous moisture reservoirs — one molecule can bind up to 1,000 times its own weight in water. With increasing age, the hyaluronic acid content of the skin decreases, contributing to water loss, reduced elasticity, and visible volume reduction.

The crucial parameter for topical HA is its molecular weight:

The study by Pavicic et al. (2011) in the Journal of Drugs in Dermatology showed that a combination of three HA fractions achieved significantly superior results in hydration, elasticity, and wrinkle reduction after 60 days of application compared to formulations with only one fraction. This finding has fundamentally changed formulation practice: High-quality HA formulations now routinely combine several molecular weight classes.

Ceramides: The Foundation of Barrier Function

Ceramides are sphingolipid-based molecules that, together with cholesterol and free fatty acids, form the intercellular lipid matrix of the stratum corneum. They create the "brick and mortar" structure of the skin barrier, which is crucial for regulating transepidermal water loss and protecting against irritants and microorganisms.

In chronic skin conditions like atopic dermatitis, as well as in photoaged and chronically dry skin, ceramide content is demonstrably reduced. Studies show that the application of topical ceramides — particularly ceramide NP (formerly ceramide 3), ceramide AP, and ceramide EOS — can measurably increase the ceramide content of the stratum corneum and significantly reduce TEWL.

For optimal effect, ceramides should be formulated in a molar ratio similar to cholesterol and free fatty acids in the stratum corneum — typically a 1:1:1 ratio. Liposomal and lamellar body-like delivery systems can further improve their incorporation into the lipid matrix. In NATURFACTOR's formulation philosophy, strengthening the barrier — recovery in the four-factor model — is a central design principle.

Squalane, Resveratrol, and Plant Stem Cell Extracts

Squalane

Squalane is the hydrogenated, stable form of squalene — a triterpene naturally found in human sebum, where it constitutes about 12–15% of sebum composition. Squalene has a dual function in the skin: It is part of the natural barrier and protects cell membranes as an endogenous antioxidant. With increasing age, the squalene content in sebum decreases significantly.

Topically applied squalane — which is stabilized by hydrogenating squalene to prevent oxidation — is characterized by exceptionally low comedogenicity and a highly tolerable, lightweight texture. It rapidly penetrates the epidermis without leaving a greasy feeling and acts as both an emollient and an occlusive. In formulations, it improves the sensory properties of other active ingredients and can serve as a carrier for lipophilic substances.

Previously, squalane was extracted from shark liver — an unacceptable source from a sustainability perspective. Today, it is exclusively obtained from plant sources: sugarcane (via biotechnological fermentation), olive oil, or amaranth. Sugarcane squalane from fermentation is considered the highest quality and most sustainable option.

Resveratrol

Resveratrol is a natural polyphenol from the stilbene class, produced in grapes, berries, and various plant species as a defense mechanism against stress and pathogens. In dermatology, resveratrol is primarily of interest due to its pronounced antioxidant activity and its ability to activate Sirtuin-1 (SIRT1) — an enzyme centrally involved in cellular stress response and epigenetic regulatory mechanisms.

When applied topically, studies show that resveratrol significantly inhibits UV-induced lipid peroxidation, reduces MMP-1 expression, and stimulates collagen I. A study by Farris et al. (2014) showed that a combination of resveratrol, baicalein, and vitamin E significantly reduced wrinkle surface and improved skin firmness after 12 weeks.

The biggest formulation challenge with resveratrol is its instability to light and oxidation. Without adequate encapsulation – for example, in liposomes, cyclodextrins, or polymer microcapsules – it degrades rapidly. High-quality resveratrol products therefore invest significantly in the delivery system, not just in the concentration of the active ingredient.

Plant Stem Cell Extracts

Plant stem cell extracts – often referred to as “plant stem cells” in cosmetics – are a relatively new ingredient segment that has gained widespread attention since about 2008. However, the term is misleading: plants do not have stem cells in the animal sense. What is formulated are extracts from undifferentiated plant cells grown in in vitro cultures (callus cultures).

The extract of the Swiss apple variety Uttwiler Spätlauber (PhytoCellTec™ Malus Domestica) is the most studied plant stem cell extract in cosmetics. An in-vitro study showed that the extract protects the vitality of human hair follicle stem cells and stimulates the proliferation of epidermal cells. A clinical study with 2% of the extract showed a visible reduction in deep wrinkles after 4 weeks. These data are interesting, but their transferability to in-vivo effects by the active ingredient in the product is still limited – further independent studies are needed here.

Extracts from grapevine stem cells (Vitis vinifera), arnica, and alpine roses have also been studied. These extracts share a profile of antioxidant polyphenols, flavonoids, and organic acids, which can provide cell-protective properties. The advantage of callus cultivation, in addition to the active ingredient profile, lies in complete independence from harvest quantities, seasons, and geographical factors – a clear gain in sustainability.

Biotechnological Production: Quality without Resource Consumption

The biotechnological production of cosmetic active ingredients is one of the most significant advances in the industry over the past two decades. It solves a fundamental dilemma: on the one hand, the demand for highly pure natural active ingredients is increasing, and on the other hand, conventional plant extracts are variable in quality, and their extraction is often resource-intensive.

The key biotechnological production processes for cosmetic active ingredients are:

Microbial Fermentation: Microorganisms – bacteria, yeasts, or fungi – are genetically engineered or modified through classical strain engineering to produce a desired active ingredient. Ectoin is obtained this way from halophilic bacteria. Squalane from sugarcane is produced by fermentation with Saccharomyces cerevisiae. The process enables consistently high purity, scalable production, and complete traceability.

Plant Cell Cultures (Callus Biotechnology): Undifferentiated plant cells are cultivated in bioreactors under controlled conditions and produce secondary plant substances of consistent quality. The apple stem cell extract already mentioned is obtained in this way. Likewise, resveratrol and various polyphenols are increasingly produced by fermentation instead of being extracted from grapes.

Enzymatic Synthesis: Enzymes catalyze specific chemical reactions with high selectivity and under mild conditions. Low-molecular-weight hyaluronic acid fractions are now produced by enzymatic degradation of high-molecular-weight fermentation HA to define exact molecular weight fractions. Ceramides can be enzymatically synthesized from plant precursor molecules.

Advantages over conventional plant extraction: Consistent active ingredient concentration independent of harvest season and cultivation location, no heavy metal or pesticide contamination, no use of organic solvents in extraction, drastically reduced water consumption, and significantly smaller ecological footprint per kilogram of active ingredient. Hyaluronic acid from fermentation, for example, is chemically identical to human HA but does not come from animal sources (traditionally from rooster combs) – a significant ethical advance.

The NATURFACTOR formulation philosophy consistently relies on biotechnologically produced active ingredients or those obtained through standardized extraction, which are tested for defined active ingredient contents by batch analysis. "Bioactive Infusion Complex™" as a central formulation principle stands precisely for this approach: bioactive substances in a concentration and quality that are actually effective at the target site – supported by studies, not by marketing promises.

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