This fruit has a high concentration of vitamin C. An average-sized carambola supplies around 30% of the daily recommended consumption of 60 mg/day.

Historically, the boats’ crews relied on salted meat and dried products, and thus they were severely affected by scurvy (lack of vitamin C). Long shipping expeditions failed because of the lack of men in good conditions of health. Scurvy, in long sea expeditions, was prevented by carrying citrus on board. Epidemiological research indicates that stomach cancer is less frequent in people who follow a diet rich in vitamin C. Due to possible adverse reactions, patients with kidney failure must not consume carambolas.