Sprouting AidMakes a Great Substitute for SaltPureNatural PreservativeIf 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.