Acacia Farnesiana Flower/Stem 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 22, 2025
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All information on this page is verified using The Personal Care Products Council's (PCPC) INCI database. Our ingredient analyses are based exclusively on PCPC's technical data to ensure accuracy and reliability.

What Is Acacia Farnesiana Flower/Stem Extract?

Acacia Farnesiana Flower/Stem Extract comes from the blossoms and stems of the sweet-scented Cassia Flower Tree, botanically known as Acacia farnesiana. The plant is native to tropical and subtropical regions where it has long been valued for its fragrant yellow blooms and soothing sap. Traditional cultures steeped the flowers in oils and water for perfumery and skin rituals, paving the way for its modern cosmetic use.

Chemically the extract offers a mix of natural tannins, flavonoids, polysaccharides and trace essential oils. Tannins give it a mild tightening feel on skin, while polysaccharides lend a light film-forming property that can help products feel smooth.

To create the cosmetic-grade ingredient, freshly harvested flowers and young stems are cleaned, air-dried then macerated. The plant material is typically soaked in a water-glycerin or alcohol-water blend, allowing the beneficial compounds to dissolve. After filtration and gentle concentration the liquid extract is standardized for consistent quality and added to formulations.

You will most often spot Acacia Farnesiana Flower/Stem Extract in toners, lightweight gels, sheet masks, after-shave lotions, balancing moisturizers and certain anti-aging serums that aim for a refined skin feel without heaviness.

Acacia Farnesiana Flower/Stem Extract’s Cosmetic Benefits/Uses

This botanical brings a couple of key functions that formulators appreciate:

  • Astringent: The natural tannins gently contract skin proteins, helping reduce the look of enlarged pores and leaving a fresh toned sensation. In products like toners or after-shave lotions this can create an immediate feeling of cleanliness and smoothness.
  • Viscosity Controlling: Its polysaccharide content can subtly thicken water-based systems, improving spreadability and stability. This lets chemists fine-tune the texture of gels, lotions and serums without relying solely on synthetic thickeners.

Who Can Use Acacia Farnesiana Flower/Stem Extract

This extract is generally suitable for most skin types, including oily, combination, normal and slightly dry skin that enjoys a light toning feel. Its gentle astringency can help those prone to visible pores or excess surface oil. Very dry or highly sensitive skin may find the tightening sensation a bit too much, so people in those groups should look for hydrating formulas that buffer the extract or opt for lower concentrations.

The ingredient is plant derived with no animal by-products, making it appropriate for vegans and vegetarians.

No data suggest that topical use poses a risk during pregnancy or while breastfeeding. Still, this is not medical advice and anyone who is pregnant or nursing should run all skincare choices past a qualified physician to be on the safe side.

Acacia Farnesiana Flower/Stem Extract is not known to cause photosensitivity, so it does not increase the skin’s vulnerability to sunburn. Standard daytime sun protection is still recommended as part of a well-rounded routine.

Potential Side Effects/Adverse Reactions

Responses to any botanical ingredient can vary from person to person. The following list covers potential side effects linked to topical use of Acacia Farnesiana Flower/Stem Extract, but most users will not experience them when the ingredient is included at appropriate levels in a well-formulated product.

  • Skin irritation such as redness or stinging in very sensitive individuals
  • Dryness or tightness if used in high concentrations on already dehydrated skin
  • Allergic contact dermatitis in people allergic to legumes or other Acacia species
  • Eye irritation if the product accidentally enters the eyes

If any discomfort or unusual reaction occurs stop using the product and consult a healthcare professional or dermatologist.

Comedogenic Rating

Rating: 1 / 5

Acacia Farnesiana Flower/Stem Extract is mostly composed of water soluble tannins, flavonoids and polysaccharides with only trace amounts of oil soluble components. Because it lacks heavier lipids that can block pores it scores very low on the comedogenic scale. In well balanced formulas it rarely contributes to clogged pores so it is generally suitable for people prone to acne or breakouts.

Keep in mind that overall pore clogging risk also depends on the other ingredients in a product as well as the user’s individual skin chemistry.

Summary

Acacia Farnesiana Flower/Stem Extract delivers two main benefits: it acts as a mild astringent that momentarily tightens the look of pores thanks to its tannin content and it helps control viscosity by adding a light natural thickness through its polysaccharides. These features let formulators create fresh feeling toners, gels and after-shave lotions without leaning heavily on synthetic thickeners.

The extract is not a blockbuster staple like hyaluronic acid or niacinamide but it enjoys steady use in niche botanical lines and certain fragrance rich products that want a touch of natural toning.

Safety data show it is low risk for most users with only rare reports of irritation or allergy. As with any new skincare ingredient it is smart to perform a quick patch test when trying a product that contains it just to be sure your skin agrees.

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