Mangosteen is a fruit with numerous health benefits. It is rich in folate, a nutrient that reduces the risk of birth defects in the unborn child. Mangosteen also has manganese that is vital for the cartilage and skeletal system of your baby. It also contributes greatly to the overall embryonic development. To add to that, mangosteen is also rich in vitamin C. It helps improve the immunity of pregnant women. A cup of fresh mangosteen can provide approximately 5.7 mg of vitamin C.