Malic Acid lowers pH a bit less than Tartaric acid, and is less sour. Excellent for making acid adjustments in Gewurztraminer, Muscat, and Reisling wines when Tartaric acid is not appropriate. You do not want to add malic acid to any wine that will undergo a malolactic fermentation, as roughly half of the added malic acid will not convert to lactic acid during a malolactic fermentation.