Oenothera Biennis Flower Extract: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 30, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Oenothera Biennis Flower Extract?

Oenothera Biennis Flower Extract is made from the bright yellow blossoms of the evening primrose plant, a hardy wildflower native to North America that now grows in many temperate regions. The petals are rich in fatty acids, flavonoids and gentle tannins, elements that give the extract its skin toning ability. Native peoples used the plant for skin soothing poultices, and by the 20th century cosmetic chemists began isolating the flower extract for its mild tightening effect on skin. To create the ingredient, freshly harvested flowers are steeped in a mix of water and safe solvents, then filtered and concentrated to keep the active compounds intact. The resulting liquid is added to toners, lightweight lotions, sheet masks, post shave balms and products aimed at refining the look of pores.

Oenothera Biennis Flower Extract’s Cosmetic Benefits/Uses

This extract is prized for its single key role as an astringent. By gently contracting the surface of the skin it can help reduce the appearance of enlarged pores, give a smoother feel and remove excess oil without over drying. It also lends a clean, refreshed finish that many people enjoy after cleansing or shaving.

Who Can Use Oenothera Biennis Flower Extract

Because its main role is light astringency, this extract is most appreciated by people with oily or combination skin who want to tame shine and refine the look of pores. Normal skin can also enjoy its fresh finish. Very dry or highly reactive skin may find repeated use a little too tightening as the natural tannins can draw out moisture, so those users might prefer it only in rinse-off or low-dose formulas.

Oenothera Biennis Flower Extract comes from a flowering plant and no animal derivatives are involved in its production, so it is suitable for both vegans and vegetarians.

No specific contraindications have been noted for pregnant or breastfeeding women when the ingredient is applied topically. Still this is not medical advice and anyone who is expecting or nursing should run any skincare product past a qualified doctor to be on the safe side.

The extract is not known to cause photosensitivity and can be used morning or night without increasing vulnerability to sunburn. It also plays well with most common skincare actives and preservatives.

Potential Side Effects/Adverse Reactions

Responses to topical Oenothera Biennis Flower Extract can differ from person to person. The following points list potential side effects that are possible yet unlikely for most users when the ingredient is formulated and used correctly.

  • Mild stinging or burning on very sensitive skin
  • Redness or flushing in individuals with rosacea or compromised skin barriers
  • Dryness or a tight feeling if overused on already dry skin
  • Contact dermatitis or itching in rare cases of botanical allergy

If any uncomfortable reaction occurs stop using the product and consult a healthcare professional if symptoms persist.

Comedogenic Rating

Rating: 1 out of 5. The flower extract contains only trace amounts of the heavier fatty acids found in evening primrose oil and is usually delivered in a water based solution. Because there is very little residue left on the skin it has a low likelihood of clogging pores. This makes it generally suitable for people who are prone to acne or frequent breakouts. As with any botanical, the finished product formula matters most, so heavier creams that include rich oils alongside the extract could still pose a risk of congestion.

Summary

Oenothera Biennis Flower Extract is valued for its mild astringent action that helps refine the look of pores remove excess surface oil and leave skin feeling fresh. It achieves this through natural tannins and gentle flavonoids that give a subtle tightening sensation without harshness. While not a headline grabbing ingredient it crops up in toners light lotions and aftershave products where a clean finish is desired.

Overall safety is high when the extract is used at typical cosmetic levels with only rare reports of irritation or allergy. Whenever you add a new product to your routine a simple patch test on a small area of skin is a smart step to rule out unexpected reactions.

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