Introduction

Prinsepia utilis seed oil is a plant-derived oil obtained from the seeds of Prinsepia utilis Royle, a member of the Rosaceae family. Its cosmetic ingredient name is generally listed as Prinsepia Utilis Seed Oil. It consists primarily of triacylglycerols, with linoleic acid, oleic acid, palmitic acid, and stearic acid as its major fatty acids.

The effects of P. utilis seed oil on the skin barrier can be considered at three levels:

① It forms an emollient oil film on the skin surface, thereby slowing water evaporation;

② It supplies exogenous fatty acids, such as linoleic acid, which may serve as partial substrates for epidermal lipid metabolism;

③ In cell-based and reconstructed skin models, it has shown preliminary effects on keratinocyte differentiation, cornified envelope formation, and inflammatory responses.

The fact that P. utilis grows in high-altitude environments does not mean that its oil can directly confer the plant’s cold tolerance or ultraviolet resistance to human skin. Its skincare value must instead be evaluated on the basis of its lipid composition, its potential involvement in cutaneous lipid metabolism, and the structural changes observed in the epidermis.

1. Source and Chemical Composition of Prinsepia utilis Seed Oil

1.1 Differences Between P. utilis Seed Oil and Other P. utilis-Derived Materials

P. utilis seeds can be processed by mechanical pressing, solvent extraction, or subcritical extraction to obtain a lipid-rich seed oil. The residual oil cake produced after oil extraction contains polysaccharides, proteins, and other water-soluble constituents.

Materials derived from different parts or fractions of P. utilis differ in both chemical composition and mechanism of action.

1.2 Lipid Composition of P. utilis Seed Oil

The principal components of P. utilis seed oil are triacylglycerols (TAGs), which are neutral lipids formed when one glycerol molecule is linked to three fatty acids through ester bonds:

Glycerol + 3 fatty acids ⇌ triacylglycerol + 3H₂O

Lipidomic studies have also detected phospholipids, glycolipids, and multiple glyceride species in P. utilis seed oil. Extraction and refining methods may alter the composition of terpenoids, steroids, quinones, and other minor compounds in addition to affecting the fatty acid profile.

The fatty acid proportions in P. utilis seed oil vary according to plant genetic source, geographic origin, degree of ripeness, extraction method, and refining intensity. The table below presents two representative analytical results from Chinese and Indian Himalayan samples. Because the studies used different raw materials and analytical methods, the values are intended only to illustrate inter-sample variability and should not be regarded as a fixed composition for P. utilis seed oil.

Greater variation in the proportions of saturated, monounsaturated, and polyunsaturated fatty acids has been observed among different plant populations in the western Himalayas. Overall, these data indicate that oleic acid and linoleic acid are generally the predominant fatty acids in P. utilis seed oil.

1.3 Skincare Significance of the Four Major Fatty Acid Classes

1.3.1 Linoleic Acid: A Key Exogenous Substrate for Barrier Lipids

Linoleic acid is an essential fatty acid that cannot be synthesized de novo by the human body. Certain specialized epidermal ceramides require linoleic acid to be esterified to the terminal ω-hydroxyl group of an ultra-long-chain fatty acid, thereby forming ω-O-acylceramides.

These acylceramides contribute to the formation of:

① The intercellular lipid lamellae of the stratum corneum;

② The corneocyte lipid envelope;

③ Low-permeability lipid structures within the epidermis.

In P. utilis seed oil, linoleic acid is primarily esterified within triacylglycerols. Before it can potentially enter epidermal lipid metabolism, it must be released, taken up by cells, activated to fatty acyl-CoA, and re-esterified. Therefore, P. utilis seed oil serves as a reservoir of linoleic acid rather than as a direct source of preformed acylceramides.

1.3.2 Oleic Acid: Improved Spreadability with Potential Effects on Lipid Fluidity

Oleic acid contains one cis double bond, which introduces a bend into the carbon chain and increases oil fluidity and spreadability on the skin.

At high concentrations, free oleic acid may insert into the lipid lamellae of the stratum corneum, disrupt the orderly packing of hydrocarbon chains, and increase the penetration of substances through the skin. Most of the oleic acid in P. utilis seed oil is esterified in triacylglycerols, and its effects cannot be equated with those observed experimentally using high concentrations of free oleic acid.

The proportion of free oleic acid may increase when the acid value of the raw material rises or when lipid hydrolysis occurs. Consequently, formulation-related risks associated with oleic acid depend mainly on the extent of oil hydrolysis, the use level, the oxidation status of the oil, and the overall emulsion structure.

1.3.3 Palmitic Acid and Stearic Acid: Sources of Saturated Fatty Acid Substrates

Palmitic acid is the principal product generated by fatty acid synthase and can be further elongated by fatty acid elongases to produce longer-chain fatty acids. Stearic acid has a relatively straight saturated carbon chain, which contributes to greater oil-film body and structural stability.

Some free fatty acids and ceramides in the stratum corneum contain long-chain or ultra-long-chain fatty acids with chain lengths of C22 or greater. Because P. utilis seed oil primarily supplies C16 and C18 fatty acids, it cannot directly replace the complete long-chain lipid system of the stratum corneum.

2. Structural Basis for the Effects of P. utilis Seed Oil on the Skin Barrier

2.1 The “Brick-and-Mortar” Structure of the Skin Barrier

The principal permeability barrier of the skin is located in the stratum corneum (SC). An intact epidermal barrier is jointly formed by corneocytes, the cornified envelope, intercellular lipids, and tight junctions in the granular layer.

P. utilis seed oil may primarily affect two aspects of this barrier:

① It forms an emollient film over the outer surface of the stratum corneum, reducing water diffusion;

② It supplies certain fatty acid substrates and may influence keratinocyte differentiation and lipid metabolism.

However, P. utilis seed oil does not contain the complete combination of ceramides, cholesterol, and long-chain free fatty acids present in the stratum corneum. It therefore cannot independently replace the entire intercellular lipid matrix.

2.2 What Transepidermal Water Loss Reflects

Transepidermal water loss (TEWL) is the rate at which water diffuses from the body through the epidermis into the external environment. When temperature, humidity, and measurement conditions are controlled, an increase in TEWL generally indicates a reduced ability of the epidermis to limit water diffusion.

A reduction in TEWL after application of P. utilis seed oil may arise from two types of effects:

① Immediate Physical Effects

P. utilis seed oil forms a hydrophobic film on the skin surface, lengthening the diffusion path for water moving outward and thereby causing a rapid decrease in measured TEWL.

② Delayed Structural Effects

With continued use, improvements in keratinocyte differentiation, ceramide synthesis, intercellular lipid organization, or tight-junction integrity may produce barrier benefits that partially persist after discontinuation or cleansing of the surface oil film.

An immediate reduction in TEWL mainly reflects surface occlusion. To determine whether structural repair has occurred within the skin itself, additional assessments are required, including TEWL after wash-off, the rate of recovery following barrier disruption, stratum corneum lipid composition, and changes in barrier-related proteins.

3. Principal Mechanisms of Action of P. utilis Seed Oil

3.1 Surface Film Formation: Rapid Reduction of Water Evaporation

After topical application, P. utilis seed oil can fill small irregularities on the surface of the stratum corneum, reduce friction between corneocytes and at the interface between the skin and the external environment, and form a partially emollient oil film over the skin surface.

The process can be summarized as follows:

Spreading of P. utilis seed oil → surface coverage by the oil phase → increased resistance to water-vapor diffusion → reduced TEWL → relief of dryness, tightness, and roughness

This effect does not depend on the synthesis of new proteins or lipids and may therefore occur rapidly. Once the oil film is removed by cleansing, the effect may diminish accordingly.

3.2 Biochemical Basis for the Participation of Linoleic Acid in Acylceramide Synthesis

Epidermal acylceramide synthesis requires several sequential steps, including the generation of ultra-long-chain fatty acids, ω-hydroxylation, ceramide synthesis, and linoleic acid transfer:

Palmitic acid → fatty acid elongases such as ELOVL1 and ELOVL4 → ultra-long-chain fatty acids → CYP4F22-catalyzed ω-hydroxylation → ω-hydroxy fatty acids → ceramide synthase 3 → ω-hydroxyceramides

Patatin-like phospholipase domain-containing protein 1 (PNPLA1) can subsequently transfer linoleic acid from triacylglycerols to ω-hydroxyceramides:

Linoleate-containing triacylglycerol + ω-hydroxyceramide

—PNPLA1→ ω-O-acylceramide + diacylglycerol

The resulting ω-O-acylceramides further contribute to the formation of stratum corneum lipid lamellae and the corneocyte lipid envelope.

This reaction demonstrates the biochemical plausibility that linoleic acid esterified within triacylglycerols may participate in the synthesis of barrier lipids. However, current studies have not fully established the proportion of topically applied linoleic acid from P. utilis seed oil that penetrates the stratum corneum, reaches the viable epidermis, and serves as an actual substrate for PNPLA1. Therefore, the statement that the oil is “rich in linoleic acid” should not be treated as equivalent to evidence that it “increases acylceramide levels.”

3.3 Endogenous Synthesis of Fatty Acids and Cholesterol

Keratinocytes can also synthesize the fatty acids and cholesterol required for the skin barrier through their own metabolic pathways.

3.3.1 Fatty Acid Synthase

Fatty acid synthase (FASN) catalyzes the conversion of acetyl-CoA and malonyl-CoA into palmitic acid.

FASN uses one molecule of acetyl-CoA as the initiating unit and sequentially incorporates seven molecules of malonyl-CoA and fourteen molecules of NADPH through repeated condensation, reduction, and dehydration reactions to generate palmitic acid.

Palmitic acid may subsequently undergo elongation and desaturation to form other fatty acids.

P. utilis seed oil supplies exogenous fatty acids. After entering cells, these fatty acids may influence lipid sensing and metabolic regulation; however, supplying fatty acids does not necessarily increase FASN expression. The clearest evidence that P. utilis-derived materials increase FASN expression has primarily been obtained with aqueous extracts of P. utilis oil cake and purified P. utilis polysaccharides rather than with the seed oil itself.

3.3.2 HMG-CoA Reductase

3-Hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR) is an important rate-limiting enzyme in the cholesterol biosynthesis pathway:

HMG-CoA + 2NADPH

—HMGCR→ mevalonate → multiple reactions → cholesterol

Cholesterol is a major component of the intercellular lipid matrix of the stratum corneum and helps regulate the fluidity and phase behavior of lamellar lipid structures.

Evidence of increased HMGCR expression in studies of P. utilis has mainly been obtained from aqueous extracts of the oil cake. In studies of P. utilis polysaccharides, the measured enzyme HMGCS2 was mitochondrial 3-hydroxy-3-methylglutaryl-CoA synthase 2. HMGCS2 is not the same enzyme as HMGCR and cannot be used to demonstrate enhancement of the rate-limiting step in cholesterol synthesis.

3.4 Ceramide Degradation and Acid Ceramidase

Acid ceramidase 1 (ASAH1) primarily catalyzes ceramide hydrolysis within acidic intracellular compartments:

Ceramide + H₂O

—ASAH1→ sphingosine + free fatty acid

The resulting sphingosine can enter the salvage pathway and be converted back into ceramide. Thus, ASAH1 participates in ceramide degradation and recycling rather than in unidirectional ceramide synthesis.

An increase in ASAH1 expression or activity may produce two different outcomes:

① When synthetic capacity is sufficient, it may accelerate ceramide turnover and sphingosine recycling;

② When the rate of degradation exceeds the rate of synthesis, it may cause a net loss of ceramides.

Animal studies have shown that excessive epidermal acid ceramidase activity can reduce stratum corneum ceramide levels and impair water retention and barrier function.

Cell and nude-mouse studies have reported increased ceramide levels in keratinocyte culture supernatants after treatment with P. utilis seed oil, together with enhanced immunohistochemical staining related to acid ceramidase in the skin. However, the study did not measure actual acid ceramidase enzymatic activity, ceramide subclasses, or metabolic flux. It therefore cannot establish that increased acid ceramidase expression was the direct cause of the observed increase in ceramides.

Comprehensive studies of the relationship between P. utilis seed oil and ASAH1, including enzymatic activity, ceramide subclass analysis, and metabolic flux, remain lacking. Accordingly, changes in ASAH1 expression alone cannot demonstrate that total ceramide content or net synthesis of barrier lipids has necessarily increased.

3.5 Keratinocyte Differentiation and Cornified Envelope Formation

Preliminary studies using reconstructed human epidermis models have shown that formulations containing P. utilis seed oil may increase certain markers associated with epidermal differentiation.

These proteins perform distinct functions:

① Filaggrin (FLG) promotes the aggregation of keratin fibers, while its degradation products contribute to the natural moisturizing factor;

② Loricrin (LOR) and involucrin (IVL) form major components of the protein scaffold of the cornified envelope;

③ Transglutaminase 1 (TGM1) cross-links cornified envelope proteins;

④ Ceramide synthase 3 (CERS3) participates in the synthesis of ultra-long-chain ceramides;

⑤ Caspase-14 and bleomycin hydrolase participate in the subsequent processing of FLG and the formation of natural moisturizing factor components.

The functional relationship can be summarized as follows:

Normal keratinocyte differentiation → FLG promotes keratin aggregation → LOR and IVL form the envelope scaffold → TGM1 completes protein cross-linking → CERS3 participates in long-chain ceramide synthesis → corneocyte and intercellular lipid structures become more complete

The relevant study used complete formulations containing 5% or 10% P. utilis seed oil in reconstructed skin models, and the formulation base may also have contributed to the observed effects. At present, the findings can be regarded as preliminary evidence that P. utilis seed oil may support epidermal differentiation and barrier formation. However, they cannot replace human clinical studies designed to distinguish the independent contribution of the oil itself.

3.6 Tight Junctions and Modulation of Inflammation

Claudin-1, occludin, and tight junction protein 1 (TJP1, also known as ZO-1) are important components of epidermal tight junctions. Claudin-1 has a well-established role in regulating paracellular permeability in the granular layer.

A reconstructed epidermis study of P. utilis seed oil reported changes in TJP1 and Claudin-5 expression. Claudin-5 is primarily associated with endothelial tight junctions, and changes observed in epidermal models should therefore be interpreted in conjunction with protein localization and cell-type analysis.

Publicly available evidence that P. utilis seed oil directly increases Claudin-1 remains limited. Findings related to Claudin-1 have mainly been obtained with P. utilis polysaccharides and aqueous extracts of the oil cake.

The same reconstructed epidermis study also observed reductions in interleukin-1α and interleukin-8 in a sodium dodecyl sulfate injury model, as well as decreased prostaglandin E₂ release in an ultraviolet B model. A 2026 study combining network pharmacology, cell experiments, and zebrafish models proposed protein kinase Bα, epidermal growth factor receptor, tumor necrosis factor, and other proteins as candidate regulatory nodes.

Highly connected proteins identified through network analysis reflect potentially relevant biological processes. They do not demonstrate that compounds in P. utilis seed oil directly bind to these proteins or act through a single established causal pathway.

4. Attribution of Research Evidence for Key Mechanistic Markers

The effects of P. utilis seed oil for which evidence is currently most concentrated include surface emolliency, fatty acid supply, and preliminary modulation of keratinocyte differentiation and inflammatory responses. Stronger evidence involving FASN, HMGCR, PPARα, and Claudin-1 has primarily been obtained from water-soluble fractions of P. utilis rather than from the seed oil itself.

In addition, a multicenter, randomized, parallel-controlled study evaluated an emollient product containing P. utilis-derived ingredients during the maintenance phase of infantile atopic dermatitis. The findings suggested that continued use of the emollient during the maintenance period may improve maintenance outcomes and delay recurrence.

However, because the study evaluated a complete emollient product and the control group did not receive an otherwise identical vehicle formulation without P. utilis seed oil, the findings cannot establish the independent clinical efficacy of pure P. utilis seed oil. They also cannot directly validate specific molecular mechanisms involving PNPLA1, CERS3, ASAH1, or related targets.

5. Scope of P. utilis Seed Oil in the Care of Environmentally Damaged Skin

5.1 Skin Protection in Cold and Low-Humidity Environments

Cold temperatures, low humidity, and wind can increase cutaneous water loss and affect corneocyte maturation and tight-junction protein expression. By forming a surface oil film, P. utilis seed oil may reduce water evaporation and help relieve tightness, scaling, and roughness caused by environmental dryness.

This effect represents barrier protection under dry environmental conditions. Frostbite involves tissue freezing, microcirculatory dysfunction, ischemia, and reperfusion injury. Current evidence does not support the use of P. utilis seed oil as an ingredient for the prevention or treatment of frostbite.

5.2 Adjunctive Care After Ultraviolet-Induced Damage

In reconstructed epidermis models exposed to ultraviolet B (UVB), P. utilis seed oil has shown preliminary effects in reducing prostaglandin E₂ release and supporting the expression of barrier-related proteins.

These findings are relevant to post-exposure inflammatory modulation and barrier recovery. They do not indicate that P. utilis seed oil has established ultraviolet-absorbing properties. Formulations containing the oil that have not undergone sun protection factor and ultraviolet A protection testing should not be used as sunscreens or ultraviolet filters.

5.3 Burns and Wound Care

P. utilis seed oil has a history of traditional use in relation to skin injury, and preliminary evidence has also been obtained from cell-migration and animal repair models. However, current data remain insufficient to support its use in the treatment of acute burns, deep burns, or open wounds.

Cosmetic-grade P. utilis seed oil is more appropriately used on intact skin for dryness, post-irritation discomfort, and care of a compromised skin barrier. When blistering, exudation, tissue necrosis, or a risk of infection is present, standardized medical wound care should be provided.

6. Formulation Applications and Efficacy Evaluation of P. utilis Seed Oil

6.1 Raw-Material Quality and Oxidative Stability

P. utilis seed oil contains a relatively high proportion of unsaturated fatty acids. Its oxidative stability is influenced by the fatty acid profile, tocopherol and sterol content, extraction process, metal ions, light exposure, temperature, and contact with oxygen.

Raw-material quality evaluation should include the following parameters:

Antioxidants, metal-ion chelators, low-oxygen manufacturing processes, and light-protective packaging with low oxygen permeability may be used to slow lipid oxidation.

6.2 Role of P. utilis Seed Oil in Biomimetic Barrier Formulations

P. utilis seed oil primarily supplies triacylglycerols and certain C16 and C18 fatty acids. It does not contain the complete combination of ceramides, cholesterol, and ultra-long-chain free fatty acids found in the stratum corneum. It is therefore more appropriately used in formulations as an emollient oil and as a source of fatty acid substrates.

A more complete barrier-repair system may include the following components:

① P. utilis seed oil: Provides an emollient film, exogenous fatty acids such as linoleic acid, and small amounts of unsaponifiable constituents;

② Ceramides: Directly replenish characteristic sphingolipids of the stratum corneum;

③ Cholesterol and free fatty acids of appropriate chain length: Support lamellar lipid organization and ordered carbon-chain packing;

④ Glycerol, amino acids, and other humectants: Increase stratum corneum hydration;

⑤ Lamellar or liquid-crystalline emulsion structures: Improve the distribution and organization of lipids on the skin surface;

⑥ An antioxidant system: Limits oxidation of unsaturated fatty acids and minor lipid constituents.

This formulation approach simultaneously addresses surface film formation, direct lipid replenishment, and endogenous epidermal metabolism. It therefore more closely reflects the physiological structure of the stratum corneum than simply increasing the concentration of P. utilis seed oil.

6.3 Efficacy Evaluation Should Distinguish Immediate Water Retention from Structural Repair

The barrier efficacy of formulations containing P. utilis seed oil can be evaluated at several levels:

1. Immediate phase: Measure TEWL, stratum corneum hydration, and skin friction shortly after application;

2. Wash-off phase: Remove the surface oil film using a standardized cleansing procedure and then reassess TEWL;

3. Continuous-use phase: Evaluate TEWL, hydration, and sensitivity-related symptoms after several weeks of use;

4. Barrier-recovery phase: Use tape stripping or a standardized surfactant challenge model to measure the rate of barrier recovery;

5. Structural phase: Assess ceramide subclasses, free fatty acid chain length, lipid order, and markers such as FLG, LOR, TGM1, and CERS3.

An immediate reduction in TEWL mainly supports an occlusive and emollient effect. Improvements that persist after wash-off, accelerated recovery following barrier disruption, and changes in lipid or protein structure provide stronger evidence of repair within the epidermis itself.

7. Classification and Research Applications of Chemicals Related to the Skin-Barrier Repair Mechanisms of Prinsepia utilis Seed Oil

Table 1. Products Related to Moisturization Assessment and Skin-Barrier Damage Models

Table 2. Products Related to Fatty Acids and Phytosterols in Prinsepia utilis Seed Oil

Table 3. Products Related to Core Stratum Corneum Lipids and Sphingolipid Metabolism

Table 4. Fatty Acid Methyl Esters and Triacylglycerols for Research Use

Table 5. Products Related to Mechanistic Validation of Lipid Metabolism and Formulation Stability

Note: The products listed above are representative Aladdin products related to scientific research and formulation studies. Additional product specifications, grades, and certificates of analysis may be searched on the Aladdin website using the product name, CAS number, or catalog number.

References

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[6] Wertz PW. Linoleate-containing acylglucosylceramide, acylceramide, and events associated with formation of the epidermal permeability barrier[J]. Skin Pharmacology and Physiology, 2023, 36(5): 225-232. DOI: 10.1159/000535049.

[7] Ohno Y, Kamiyama N, Nakamichi S, et al. PNPLA1 is a transacylase essential for the generation of the skin barrier lipid ω-O-acylceramide[J]. Nature Communications, 2017, 8: 14610. DOI: 10.1038/ncomms14610.

[8] Schild J, Kalvodová A, Zbytovská J, et al. The role of ceramides in skin barrier function and the importance of their correct formulation for skincare applications[J]. International Journal of Cosmetic Science, 2024, 46(4): 526-543. DOI: 10.1111/ics.12972.

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[10] Tu Y, An R, Gu H, et al. The water extracts from the oil cakes of Prinsepia utilis repair the epidermal barrier via up-regulating corneocyte envelope-proteins, lipid synthases, and tight junction proteins[J]. Journal of Ethnopharmacology, 2024, 330: 118194. DOI: 10.1016/j.jep.2024.118194.

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[13] Takada M, Sashikawa-Kimura M, Ohno Y, et al. Acid ceramidase overactivity drives ceramide loss, leading to atopic dry skin and Th2-skewed immune polarization[J]. The Journal of Pathology, 2026, 269: 232-247. DOI: 10.1002/path.70050.

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