Gen Professional Vitamin C-1000 is a high-potency supplement that provides pure vitamin C to strengthen the immune system, improve skin health, and combat fatigue. Each tablet contains 1000 mg of vitamin C, making it an excellent choice for those seeking an extra boost of this essential vitamin. Composition Vitamin C (ascorbic acid). Instructions for use Take one tablet a day with water. Pharmaceutical advice Vitamin C is essential for the immune system and skin. Boost your defenses and maintain healthy skin with Vitamin C-1000.