From the Kindle version of "Timeless Secrets of Health and Rejuvenation" by Andreas Moritz
"Some people may have difficulty drinking apple juice in the large quantities required for the liver flush. These include those who suffer from diabetes, hypoglycemia, and yeast infection (Candida), cancer, and stomach ulcers. In any cases of this kind, you may replace apple juice with malic acid in powdered form. Try to avoid malic acid capsules, especially if they contain other ingredients. It is best if the malic acid is properly dissolved before ingesting it. The preparation period is the same as for the apple juice regimen, except that ½ to 1 teaspoon of malic acid, taken with 32 ounces of room-temperature water (or more if it tastes too acidic for you), substitute for the 32 ounces of apple juice per day. Drink this solution in small amounts throughout the day. Food-grade malic acid powder (not mixed with magnesium or other ingredients) is very inexpensive and can be purchased over the Internet or from some natural health food stores. All wineries use malic acid to produce wine. (See Product Information at the end of the book)"