Rebaudioside A
INCI: REBAUDIOSIDE A
Reviewed by Emma · Last updated 14 Aug 2026
A natural sweetener with emerging research into scalp and skin conditioning properties
Best For Skin Types
All
Addresses
Usage Frequency
Daily
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What Is Rebaudioside A?
Rebaudioside A (often abbreviated as Reb A) is a naturally occurring compound derived from Stevia rebaudiana leaves. It is a steviol glycoside, which means it's a sweet-tasting molecule that has been used as a non-caloric sweetening agent in food and beverages for many years. In skincare, it functions as a skin conditioning agent.
Beyond its sweetness, rebaudioside A has begun to attract attention in skincare research for its potential interactions with sensory receptors found on skin cells and hair follicles. These chemosensory pathways may influence various skin and scalp functions, though this area of study is still relatively new.
How It Works
Rebaudioside A works through a mechanism distinct from typical moisturising ingredients. Recent research has identified that human skin and hair follicles express bitter taste receptors — sensory proteins usually associated with taste. When rebaudioside A interacts with one of these receptors (TAS2R4), it may trigger biochemical signalling pathways that influence hair growth and potentially other skin functions.
This chemosensory mechanism is still being studied, and much remains to be understood about how significantly it affects skin and scalp health in real-world use.
Clinical Evidence & References
Research has demonstrated that rebaudioside A can stimulate the TAS2R4 bitter taste receptor found in human hair follicles in laboratory and ex vivo settings. Studies suggest this stimulation may inhibit hair growth in these controlled environments, which could have implications for scalp health and potentially unwanted hair reduction.
However, evidence in living subjects (in vivo studies) and long-term clinical trials remain limited. The concentration at which rebaudioside A exerts these effects in topical products, and whether such effects translate to meaningful outcomes for users, requires further investigation. Current research is promising but preliminary.
Published Research
How to Use
Rebaudioside A is typically incorporated into formulations at low concentrations as a supporting ingredient rather than a primary active. As part of a wider skincare routine, it can be used daily within products designed for hydration or scalp care. There are no known restrictions on combination with other skincare ingredients, though as with any new product, patch testing is prudent if you have particularly sensitive skin.
Safety & Precautions
Frequently Asked Questions
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