What health supplements or vitamins should a girl in her 20s take to build up her immune system? i constantly have problems, would like to correct it.

See answer: Most important things you can do to improve and maintain good health and a strong immune system include: heart-healthy diet, regular daily exercise, adequate sleep, reducing stress. Though taking vitamins and nutritional supplements are a way to fill in gaps in your nutrition, there is more and more controversy over their benefits. Women your age need adequate iron, folic acid, calcium, and vit d.