Melrose 100% Pure Ascorbic acid powder. Vitamin C. easy to use. Prevention/treatment of Vitamin C deficiency. Relief of symptoms of mild upper respiratory infections. Melrose Vitamin c is an easy to use water soluble powder, free from any additives including flavours. Pure ascorbic acid is regarded as an ideal form of oral Vitamin C supplementation (with the exception of people prone to gastrointestinal distress from highly acidic compounds). The benefits of ascorbic acid are that it relieves the symptoms of mild upper respiratory infections by reducing the severity and duration of symptoms, also improving the absorption of iron.