Malic acid can be used to decrease the pH in wine and mead.

It is the primary acid in apples and pears. It is a popular acid among winemakers for adjusting acid in fruit wines as well as mead. Malic acid is also used to adjust the tartness of cider.
Use as directed by recipe.

Malic Acid is one of the main acids found in the acidity of grapes. Its concentration decreases the more a grape ripens. Malic Acid provides a strong link to wines tasting ‘flat’ if there is not enough.