Yumberry (Myrica rubra), also known as Chinese bayberry or yangmei, has a long history of use in traditional Chinese medicine. Historically, it has been used for its purported benefits to the circulatory system, including support of the blood vessels and capillaries, due to its high content of antioxidants, particularly anthocyanins and flavonoids. These compounds are believed to help strengthen blood vessel walls and reduce oxidative stress, which could theoretically benefit capillary health.

However, direct scientific studies specifically examining Yumberry's effects on capillary function in humans are limited. Most available research has focused on its antioxidant and anti-inflammatory properties, as well as potential cardiovascular benefits in general. Some in vitro and animal studies suggest that extracts from Yumberry may reduce oxidative damage and improve vascular function, but evidence in humans, particularly regarding direct capillary support, is lacking.

In summary, while there is traditional precedent for the use of Yumberry to support the circulatory system and blood vessels, robust scientific validation of its effects on capillaries specifically is currently insufficient. More targeted research, especially in clinical settings, is needed to substantiate these traditional claims.