What it is
Bletilla striata is an orchid whose tubers contain mucilaginous polysaccharides (often referred to as bletilla glucomannan) along with other water-binding constituents. In skincare and sun-care the extract acts as a humectant and forms a light, smoothing film that helps maintain surface hydration and a soft feel. It is a common botanical in East Asian formulations, where it is used for its conditioning and soothing qualities.
Safety & warnings
The extract is generally well tolerated, with its hydrating polysaccharides considered gentle on skin. As a botanical extract there is a small possibility of plant-related sensitivity in predisposed individuals. It is not considered comedogenic.
Origin & sourcing
Natural, derived from the dried tubers (pseudobulbs) of the terrestrial orchid Bletilla striata, used in traditional East Asian herbal practice.
Questions everyone asks
What part of the plant is used?
The tuber, or pseudobulb, of the Bletilla striata orchid, which is rich in mucilaginous polysaccharides.
Why is it added to sunscreen?
It contributes hydration and a smoothing, conditioning film rather than acting as a UV filter.