Citric acid is a lemon substitute, used for adding flavors. It is rich in antioxidants beneficial for the body in all ways from heart health. Fudco Citric Acid 300g .100% Pure, Premium Quality Food-grade Citric Acid A natural preservative and a commonly used ingredient for cheese-making. Citric acid is extracted from Cirtus fruits, Citric acid is a flavouring and preservative in food and beverages. The Indian names include sour salt.