Broussonetia Kazinoki Root 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 23, 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 Broussonetia Kazinoki Root Extract?

Broussonetia Kazinoki Root Extract comes from the roots of Broussonetia kazinoki, a small tree in the mulberry family that is better known as paper mulberry. The roots are rich in natural flavonoids and phenolic compounds such as kazinol A and B which are valued for their calming and antioxidant traits. The tree has been used for centuries in East Asia to make traditional paper and its roots were included in folk preparations aimed at keeping skin comfortable. Modern cosmetic labs start by washing and drying the harvested roots, then grinding them into a fine powder. The powder is soaked in a mild solvent like water or propylene glycol to pull out the skin friendly molecules. After filtering and concentrating the liquid, the extract is standardized and preserved so it can blend smoothly into finished formulas. You will most often spot Broussonetia Kazinoki Root Extract in hydrating serums, soothing masks, lightweight lotions, anti aging creams and after sun products that promise to keep skin calm and supple.

Broussonetia Kazinoki Root Extract’s Cosmetic Benefits/Uses

In skincare this plant derivative plays a single yet important role: skin conditioning. It supports the skin’s natural barrier, helps retain moisture and leaves the surface feeling soft and smooth. Its antioxidant components also lend a hand by neutralizing everyday environmental stressors which can make the complexion look dull or tired, so products that include the extract often claim a fresher more comfortable feel after use.

Who Can Use Broussonetia Kazinoki Root Extract

This root extract is gentle enough for most skin types including dry, normal, combination, oily and sensitive. Its calming nature means it rarely triggers redness or excess oil, so even reactive or acne-prone skin can usually enjoy it. There are no known reasons it would be unsuitable for any particular skin type unless you have a specific allergy to mulberry relatives.

Because the extract is plant derived and normally processed without animal by-products it is considered suitable for both vegans and vegetarians. Those following a strict lifestyle may still want to confirm that the finished product has not been tested on animals and that all other ingredients share the same origin.

Pregnant or breastfeeding users are not expected to face problems with topical use of Broussonetia Kazinoki Root Extract, as it has no recorded hormonal activity and very low skin penetration. This is not medical advice and anyone who is expecting or nursing should run any skincare choice past a doctor to be on the safe side.

The extract does not increase photosensitivity so there is no special need for extra sun protection beyond the daily SPF dermatologists already recommend. It also plays well with common actives like hyaluronic acid, niacinamide and gentle exfoliating acids.

Potential Side Effects/Adverse Reactions

Reactions to topical Broussonetia Kazinoki Root Extract differ from person to person. The following list covers potential side effects but most users should not expect to experience them when the ingredient is included at normal cosmetic levels.

  • Mild redness or warmth especially on very sensitive skin
  • Temporary itching if the formula also contains strong fragrances or alcohol
  • Allergic contact dermatitis in rare cases for individuals allergic to plants in the mulberry family
  • Eye irritation if a product containing the extract accidentally gets into the eyes

If any irritation or discomfort occurs stop using the product and seek advice from a healthcare professional.

Comedogenic Rating

Rating: 0 out of 5. Broussonetia Kazinoki Root Extract is water-soluble and contains almost no heavy oils or waxes, so it does not clog pores. Its antioxidant and soothing molecules sit lightly on the skin and rinse away easily, making the extract a safe pick for people prone to acne or breakouts. No data suggest it worsens blackheads or whiteheads and it is often paired with lightweight gel or serum bases that keep pores clear.

Summary

Broussonetia Kazinoki Root Extract conditions the skin by supporting the moisture barrier and delivering antioxidants that fend off daily environmental stress. These benefits come from its natural flavonoids and phenols, which help skin feel softer, look fresher and stay comfortable. While the ingredient is not as famous as hyaluronic acid or vitamin C it has a quiet presence in calming serums, after-sun gels and gentle creams where it adds soothing power without heaviness.

Overall safety is high, with very few reports of irritation or allergy. Still, every skin is different so it is smart to patch test any new product that contains this extract before using it all over the face.

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