Rheum Rhabarbarum 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 Rheum Rhabarbarum Extract?

Rheum Rhabarbarum Extract is a plant derived ingredient made from the whole rhubarb plant, Rheum rhabarbarum, part of the buckwheat family. The stalks of rhubarb are a familiar food, yet the entire plant contains a mix of natural acids, sugars and polyphenols that can be helpful for skin care. Traditional herbalists valued rhubarb for its soothing traits, which led formulators to explore it for lotions and creams. To create the extract, the fresh or dried plant is soaked in a water or water–alcohol solution, then filtered and gently concentrated until a stable liquid or powder remains. Today you will spot Rheum Rhabarbarum Extract in moisturizers, calming masks, after-sun gels and anti aging serums where a touch of plant based comfort is desired.

Rheum Rhabarbarum Extract’s Cosmetic Benefits/Uses

The main role of Rheum Rhabarbarum Extract in skin care is skin conditioning. It helps keep the surface of the skin soft, smooth and hydrated by supporting the skin’s natural moisture balance. When included in a formula it can leave the complexion feeling calmer and looking more even which makes it a welcome addition to daily hydrators, soothing treatments and recovery products.

Who Can Use Rheum Rhabarbarum Extract

Rheum Rhabarbarum Extract is mild enough for most skin types. Dry or mature complexions appreciate its moisture supporting nature while normal and combination skin enjoy its lightweight feel. Oily and acne prone skin can usually use it without worry because the extract is not known to clog pores. People with a known allergy to rhubarb or other members of the buckwheat family should avoid it as a precaution.

Because the ingredient is completely plant derived it is suitable for vegans and vegetarians. No animal sourced materials are involved in its harvest or processing.

Topical use during pregnancy or while breastfeeding is not linked to specific concerns in the research available, yet data is limited. This is not medical advice and anyone who is pregnant or nursing should run new skincare choices past a qualified health professional to be safe.

The extract does not increase photosensitivity so it can be used in morning or evening formulas. Normal daytime sunscreen habits should still be followed.

Potential Side Effects/Adverse Reactions

Side effects from the topical application of Rheum Rhabarbarum Extract vary from person to person. The following is a list of potential reactions, but most users will not experience them when the ingredient has been properly formulated and used as directed.

  • Redness or mild irritation on very sensitive skin
  • Itching or tingling that subsides after rinsing
  • Allergic contact dermatitis in individuals allergic to rhubarb or related plants
  • Temporary stinging if applied to broken or freshly exfoliated skin
  • Interaction irritation when layered with strong exfoliating acids or retinoids

If any of these effects occur stop using the product and consult a healthcare professional if symptoms persist.

Comedogenic Rating

Rheum Rhabarbarum Extract carries a comedogenic rating of 1. The extract is mostly composed of water soluble acids, sugars and antioxidants rather than heavy oils or waxes that can lodge in pores. While any ingredient could, in theory, contribute to congestion if used in an overly rich formula, the plant’s lightweight profile and history of use in calming gels and toners suggest a very low likelihood of clogging. Because of this, most people prone to acne or breakouts can comfortably use products containing this extract. If the finished product also contains richer butters or occlusive silicones, those additional ingredients are more likely to determine whether the formula feels pore friendly.

Summary

Rheum Rhabarbarum Extract is valued in cosmetics for its skin conditioning talent. By delivering gentle hydration and soothing polyphenols it helps keep skin soft, comfortable and visually even. It is still a niche botanical so you will not spot it on every ingredient list, yet formulators who favor plant based comfort boosters like adding it to moisturizers, after sun lotions and calming serums.

Overall safety is high with only rare reports of irritation or allergy in users sensitive to rhubarb or related plants. When trying any new product it is wise to perform a quick patch test first to confirm personal compatibility.

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