Coca (Erythroxylum coca) leaves have a long-standing traditional use among indigenous peoples of the Andes, where they are chewed or brewed as a tea for a variety of health benefits. The historical and ethnobotanical literature indicates that coca has been used to combat fatigue, hunger, and altitude sickness. Some traditional uses also involve promoting general cardiovascular health, which could be interpreted as supporting the capillaries and circulatory system, although this is not a primary or specifically documented use in traditional medicine.

Scientifically, the main active compounds in coca leaves are alkaloids, including cocaine, but at much lower concentrations than found in illicit preparations. There is little to no direct scientific evidence supporting the specific benefit of coca leaves for capillary health. Most research focuses on the central nervous system effects, metabolic impact, and potential for abuse. Some studies have looked at coca's mild stimulant effect, which may improve circulation indirectly, but data on direct capillary support is lacking. Therefore, its use for capillary support is justified primarily by tradition, not robust scientific validation.