Yes, I believe that it is for the malic acid. But if you have serious blood sugar issues, I would suggest buying some pure malic acid (not magnesium malate) from a wine making shop, mix it with water 3X/day & get your malic acid that way. But it is not as healthful as the apple juice, and could cause some stomach disturbance; at least it did for me, when I tried it as an experiment. I will eat a good diet with sufficient protein and take the apple juice as per Dr Sutter's instructions for 3 days when I am finished with the bowel cleansing.