Nale GM-C Retard is a slow-release vitamin C supplement that provides a steady supply of this essential vitamin for immune and skin health. Each capsule contains pure ascorbic acid to help keep you healthy and protect against colds and illness. Composition Vitamin C (ascorbic acid). Instructions for use Take 1 capsule daily with food. Pharmaceutical advice Vitamin C is essential for a healthy immune system and healthy skin. Keep your defenses strong with a daily dose.