My mother has suffered from constipation for years and we only discovered from reading a book by Linus Pauling that Vit C was the answer. She requires 6 to 8 grams per day for normal bowel activity. Ironically that is the dose recomended to treat her PD. She breaks it up into three doses each with a meal. We started out with one gram per day, then two, then three until finding out what was right for her. We use the powered from Bronson Vitamins and Herbs. Carol Brow [log in to unmask]