Vitamin C deficiency affects almost every aspect of health detrimentally. It weakens the immune system, slows down healing, weakens the veins, and decreases energy. Vitamin C deficiency affects almost every aspect of health detrimentally. It weakens the immune system, slows down healing, weakens the veins, and decreases energy. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle