Phytic acid (Inositol hexaphosphate) (IP6)

Phytic acid, also known as inositol hexaphosphate (IP6), is a naturally occurring polyphosphorylated carbohydrate found abundantly in plant seeds, grains, and legumes, where it serves as the primary storage form of phosphorus [1, 3]. In the human diet, it is often characterized as an anti-nutrient due to its high affinity for divalent cations like calcium, iron, and zinc, which leads to the formation of insoluble complexes and reduced mineral bioavailability [2, 4]. Despite this, phytic acid demonstrates significant therapeutic potential as an antioxidant and an inhibitor of pathological calcification [2, 5]. It is particularly noted for its role in preventing the formation of kidney stones by inhibiting the crystallization of calcium salts in the urinary tract [2, 6]. Furthermore, emerging research suggests that phytic acid may possess anti-cancer properties by modulating cell cycle progression and promoting apoptosis in various tumor cell lines [5]. Consequently, it is a molecule of interest in both nutritional science and pharmacology for its dual role as a dietary factor and a potential therapeutic agent [4, 6].

Other names

PhytateMyo-inositol hexakisphosphateInositol hexakisphosphateIP6Inositol polyphosphateFytic acid

Phytic acid acts primarily as a potent chelator of multivalent metal cations such as calcium, magnesium, iron, and zinc, forming insoluble complexes that inhibit their absorption in the gastrointestinal tract [1, 4]. In a therapeutic context, it inhibits the formation of calcium oxalate and calcium phosphate crystals in the urine, thereby preventing kidney stone formation [2, 5]. It also exhibits antioxidant properties by chelating iron and preventing the generation of hydroxyl radicals via the Fenton reaction [1, 4]. At the cellular level, it may modulate intracellular signaling pathways, such as the PI3K/Akt and MAPK pathways, to influence cell proliferation and apoptosis [5, 6].