Rhamnose

Rhamnose is a naturally occurring six-carbon sugar (deoxyhexose) found in plant cell walls and polysaccharides. In skincare formulations, it functions as a humectant—drawing moisture into the skin—and can also serve a masking function to improve product texture and feel.The ingredient appears in roughly 0.2% of skincare products, typically at modest concentrations. It is derived from natural sources and is used primarily for its potential skin-conditioning properties rather than as a preservative or active in the traditional sense.

Rhamnose appears to work at the cellular level, particularly within dermal fibroblasts—the cells that produce and maintain collagen and elastin. The available evidence suggests it may help these cells function optimally and resist some of the biochemical changes associated with aging, such as the accumulation of glycated proteins.As a humectant, rhamnose also works on the surface and upper layers of skin by drawing water molecules into the stratum corneum, helping to maintain hydration levels and support the skin's barrier function.

Rhamnose is typically found as a supporting ingredient in serums, moisturisers, and hydrating products rather than as a standalone active. Use products containing it as directed, morning and evening as part of your regular skincare routine. It pairs well with other humectants and antioxidants, and is generally gentle enough for layering with other ingredients.

Rhamnose is a naturally derived carbohydrate with a favourable safety profile and is generally well-tolerated across skin types. No significant adverse effects have been reported in cosmetic use at typical concentrations.