For more, visit TIME Health. We all have friends who were born in the same year but look years younger or older than we do. Now researchers say that such. Ball Citric Acid for Preserving Tomatoes, 7. Tomatoes need a lower p. H so that they may be water bath canned. Citric acid naturally lowers the p. H without changing the tomato flavor like lemon juice does. This product provides a pantry ready alternative to lemon juice when canning tomatoes. Citric acid is called for in 9. USDA tomato recipes. Keep your tomatoes tasting like tomatoes This bottle will can up to 7. Kosher certified. Ingredients Citric Acid, Less Than 2 Silicon Dioxide Anticaking.