While a current nutritional analysis didn't reveal fiber content, there is most likely only a few milligrams of fiber, if any. One capsule of Phytomax contains 400 mg of Hydrilla verticillata, and in those 400 mg there is only about 1.1 total calories from the naturally occurring carbohydrates, protein, and fat. Since fiber is considered a carbohydrate source, with such a minuscule amount of calories contained in a capsule of Phytomax, it is estimated that the amount of fiber, if there is any to begin with, would only be a couple of milligrams. Taking into account that our suggested daily fiber amounts are 40+ grams, equal to 40,000 milligrams, Phytomax would not be considered a source of fiber.