How do the two forms differ?
| Difference | Arbutin | Alpha arbutin |
|---|---|---|
| Chemical name | Also called beta arbutin | A distinct alpha form |
| Structure | Hydroquinone attached to glucose in the beta arrangement | Hydroquinone attached to glucose in the alpha arrangement |
| Natural occurrence | Found in plants, including bearberry | Not naturally occurring; made through synthesis |
| Biological properties | Similar to alpha arbutin, but not identical | Similar to beta arbutin, but not identical |
The difference is the orientation of the chemical bond, not the addition of a separate brightening ingredient. Chemists call these forms stereoisomers: molecules whose parts have different spatial arrangements. The word alpha identifies a chemical form, rather than awarding it a corner office. A product named arbutin should therefore not automatically be treated as an alpha arbutin product.2
Is alpha arbutin better for dark spots?
Alpha arbutin is not automatically the better choice. The two forms have similar, but not identical, biological properties, and their relative advantages for skin lightening remain debated. Arbutin targets tyrosinase, an enzyme involved in making melanin, the pigment that gives skin its colour. Reducing melanin production is why arbutin is used in products for dark spots.12
For choosing a product, distinguish the exact ingredient from the finished formula. Arbutin formulations can differ in stability, delivery into skin and release of the ingredient. The name alone cannot tell you how effectively a particular serum will reduce pigmentation. Choose by the named ingredient and the finished product's directions, rather than letting one Greek letter run the shopping trip.1
Is arbutin the same as hydroquinone?
No. Both forms contain hydroquinone chemically bound to glucose, rather than being plain hydroquinone. That distinction does not mean hydroquinone release is impossible: hydroquinone can be generated during product use. Arbutin can also rarely cause dermatitis, meaning skin inflammation. Stop using the product if a rash develops.1
Where this answer comes from
- 1Arbutin as a Skin Depigmenting Agent with Antimelanogenic and Antioxidant Propertiespmc.ncbi.nlm.nih.gov
- 2Chemical and Biocatalytic Routes to Arbutinpmc.ncbi.nlm.nih.gov
