INCI: Oenothera Biennis (Evening Primrose) Oil - Also known as: EPO, Evening Primrose Seed Oil
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Key |
Value |
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INCI Name |
Oenothera Biennis (Evening Primrose) Oil |
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Category |
Botanical Seed Oil / Omega-6 Fatty Acid Source |
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Concentration in Formula |
Organic, present at greater than 5% in the Barrier Repairing Oil-Serum |
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Suitable For |
Dry to combination skin; well-studied for dry and eczema-associated skin |
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Origin |
Cold-pressed from the seeds of Oenothera biennis, a flowering plant native to North America |
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Irritation Risk |
Low |
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Comedogenic Rating |
2-3 |
Evening primrose oil is cold-pressed from the seeds of Oenothera biennis, a flowering plant native to North America that has been used in traditional herbal practice for centuries. Its botanical name references the plant's characteristic of opening its flowers at dusk. In modern skincare science, it is most studied for its fatty acid profile - specifically its exceptionally high linoleic acid content (typically 70-80%) and a notable concentration of gamma-linolenic acid (GLA, typically 8-14%), an omega-6 fatty acid that is relatively rare among common skincare oils.
Linoleic acid is an essential fatty acid that the human body cannot synthesize independently - it must be obtained externally, whether through diet or topical application. In the skin, linoleic acid is a critical component of ceramide EOP (the esterified omega ceramide that plays a studied role in the lamellar lipid architecture of the stratum corneum) and of the overall intercellular lipid matrix. Skin that is deficient in linoleic acid is associated with a rougher surface texture and a more permeable barrier. Evening primrose oil is one of the richer botanical sources of linoleic acid available for topical use.
At Sweet Chemistry, organic evening primrose oil is present at greater than 5% in the Barrier Repairing Oil-Serum, where it is one of eleven organic botanicals each present at a meaningful concentration. Its inclusion alongside other linoleic-rich oils supports the formula's comprehensive approach to barrier lipid support.
Evening primrose oil's primary contribution in skincare is as a source of linoleic acid and GLA - two fatty acids associated with distinct aspects of skin barrier and comfort support. Linoleic acid is studied in connection with the barrier lipid matrix, where its presence as a component of Ceramide EOP places it at the structural level of the lamellar bilayer. When the skin's linoleic acid environment is depleted, Ceramide EOP production may be affected - and topical application of linoleic acid-rich oils is studied in connection with supporting this component of the barrier lipid environment.
Gamma-linolenic acid (GLA) is associated in research with a more comfortable, less reactive-looking skin surface. GLA is an omega-6 precursor in pathways associated with the production of specific prostaglandins - research in this area has explored the relationship between GLA and the skin's surface inflammatory environment. In the context of dry or easily sensitized skin, this research-based character makes evening primrose oil a particularly relevant botanical in a barrier-supporting formula.
In the Oil-Serum, evening primrose oil works alongside other linoleic-rich botanicals including rosehip, red raspberry, sea buckthorn, and cranberry seed oils to create a comprehensive omega fatty acid environment that complements the ceramide and phytosphingosine complex in the same formula. Together, they address the barrier's fatty acid requirements at both the topical emollient and structural lipid levels.
In 1 Formula
Organic evening primrose oil is specific to the Barrier Repairing Oil-Serum, where it is present at greater than 5% as part of a carefully selected panel of eleven organic botanical oils - each chosen for functional relevance rather than cosmetic inclusion.
Nourishment - Dry to Combination
Barrier Repairing Oil-Serum Evening Primrose Oil (Organic, >5%) - 1.0 oz / 30 ml
A 100%-active, waterless serum delivering 7% THD ascorbate, 7% squalane, 3% Matrikynes® peptides, 3% ceramides, and a comprehensive omega fatty acid and barrier lipid complex. Evening primrose oil contributes linoleic acid and GLA alongside the other organic botanical oils in this formula.
Barrier Lipid Ceramide NP + Ceramide NG
INCI: Ceramide NP, Ceramide NG.
At 3% in the Oil-Serum as part of the full anhydrous barrier lipid complex. Synergy Note: Evening primrose oil's linoleic acid is the same essential fatty acid found esterified within Ceramide EOP's structure - topical linoleic acid and ceramides approach the barrier lipid environment from different but complementary directions.
Omega Fatty Acids Linoleic Acid / Linolenic Acid
INCI: Linoleic Acid, Linolenic Acid.
Free essential fatty acids present below the 1% line in the Oil-Serum, complementing the linoleic acid delivered via evening primrose oil and the other botanical oils. Synergy Note: Evening primrose oil delivers linoleic acid within a whole botanical oil matrix; the independently listed linoleic and linolenic acids extend the free fatty acid component of the barrier lipid complex in the same formula.
Skin-Identical Lipid Squalane
INCI: Squalane.
At 7% in the Oil-Serum as the primary emollient carrier base. Synergy Note: Squalane's oxidative stability as a saturated hydrocarbon complements the more reactive polyunsaturated fatty acids in evening primrose oil - its presence in the same formula helps buffer the oxidation risk that comes with linoleic-rich botanical oils.
ECM Peptide Complex Matrikynes® Bone Peptides
INCI: Hydrolyzed Cow Bone Extract.
At 3% in all four formulas, associated with improvements in the appearance of skin density and aging signs. Synergy Note: A more intact, fatty acid-replete barrier environment - supported by evening primrose oil's linoleic contribution - creates a more favorable surface context for the dermal-targeting activity associated with Matrikynes® peptides.
