Sprouting Aid. Makes a Great Substitute for Salt. Natural Preservative. Vegan / Vegetarian. Kosher. If you're into sprouting then you're already familiar with Citric Acid, a natural preservative typically found in citrus fruits such as lemons and limes. Citric Acid helps to inhibit the formation of mold and other bacterial growth, an all-too common occurrence when sprouting in a jar due to high temperatures and humidity. Citric Acid is also useful for canning vegetables and fruit preserves.