Rhynchosia Nulubilis Seed 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 Rhynchosia Nulubilis Seed Extract?

Rhynchosia Nulubilis Seed Extract comes from the small brown seeds of Rhynchosia nulubilis, a climbing bean plant in the pea family that grows across parts of Asia. The seeds are naturally rich in proteins, fatty acids, sugars, vitamins and plant antioxidants called flavonoids. These nutrients help explain why the extract shows up in skin care.

Traditional folk remedies used crushed Rhynchosia seeds to soothe dry or irritated skin. Modern formulators took note in the early 2000s when studies highlighted the bean’s stable antioxidants and emollient lipids. Today manufacturers usually create the extract by cleaning and grinding the seeds, performing a gentle water-or-glycerin soak, then filtering out the solids. The liquid that remains is concentrated and preserved for use in cosmetics.

You are most likely to see Rhynchosia Nulubilis Seed Extract in moisturizers, anti-aging serums, sheet masks, overnight creams and soothing after-sun treatments where it supports hydration and helps protect skin from daily environmental stress.

Rhynchosia Nulubilis Seed Extract’s Cosmetic Benefits/Uses

Formulators choose this plant extract because it tackles several common skin needs at once:

  • Antioxidant – Supplies flavonoids that help neutralize free radicals produced by UV light and pollution which in turn can lessen the look of dullness and early fine lines
  • Skin conditioning – Adds a mix of amino acids and sugars that attract moisture so skin feels softer smoother and more supple
  • Emollient – Delivers lightweight seed oils that fill in microscopic surface gaps creating a silky finish while reinforcing the skin’s natural barrier

Who Can Use Rhynchosia Nulubilis Seed Extract

This extract is generally well tolerated by all skin types. Dry and mature skin tend to appreciate its moisturizing lipids while normal and combination skin benefit from the lightweight finish. Even oily skin can usually handle it because the seed oils absorb quickly and do not leave a heavy film. The only group that may need extra caution is very sensitive or allergy-prone skin, particularly anyone with a known legume or peanut sensitivity, since Rhynchosia belongs to the same plant family.

Because the ingredient comes entirely from a plant source and is processed without animal derivatives it is suitable for vegetarians and vegans.

No data point to any specific risks for women who are pregnant or breastfeeding when using Rhynchosia Nulubilis Seed Extract topically. This is not medical advice and pregnant or nursing women should always run any skincare product past a qualified doctor just to be on the safe side.

The extract does not make skin more sensitive to sunlight so it is unlikely to cause photosensitivity. It pairs well with most common actives such as niacinamide or hyaluronic acid and does not interfere with mineral or chemical sunscreens.

Potential Side Effects/Adverse Reactions

Individual responses to topical Rhynchosia Nulubilis Seed Extract can vary. The issues listed below are only potential side effects and are not expected for the average user when the ingredient has been correctly formulated.

  • Mild redness or stinging
  • Itching or tightness in very sensitive skin
  • Allergic contact dermatitis in people allergic to legumes such as peanuts or soy
  • Rare localized swelling or hives

If you notice any of these reactions stop using the product and consult a healthcare professional.

Comedogenic Rating

Rating: 1/5

Rhynchosia Nulubilis Seed Extract contains mostly water-based antioxidants and small amounts of lightweight seed lipids that absorb quickly, so it is unlikely to block pores. Its fatty acid profile is closer to quick-absorbing oils than to heavy occlusives like coconut oil, which keeps the clogging potential low.

Because of this low rating, the extract is generally considered suitable for skin that is prone to acne or breakouts. As with any ingredient, the final impact also depends on the overall formula and how heavily the product relies on other comedogenic components.

Summary

Rhynchosia Nulubilis Seed Extract works as an antioxidant, skin conditioner and emollient. Its flavonoids neutralize free radicals, its amino acids and sugars draw water into the skin and its light lipids smooth the surface while supporting the skin barrier.

Although not a household name, the extract is quietly gaining traction in moisturizers, serums and soothing masks because it multitasks without feeling greasy. Safety data show it is well tolerated for most users, with legume allergies being the main caution. As with any new skincare product it is smart to do a quick patch test to confirm your skin agrees with it.

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