Supplement analysis backed by scientific evidence · PT

← All supplements
Limited evidenceLongevity & antioxidants

IP-6 (Inositol Hexaphosphate)

IP-6 is phytic acid — the same compound nutritionists call an antinutrient in beans and grains — repackaged as an anticancer supplement. Preclinical data are genuinely interesting; human trial data are two small pilot studies, and the mineral-binding downside is well established.

What the science says

  • Slows or prevents cancer Limited evidence

    IP-6 inhibits growth and induces differentiation in a wide range of cancer cell lines and rodent tumor models, with the colon literature being the most developed. Human data amount to small pilot studies — most cited is a pilot in colorectal cancer patients receiving IP-6 plus inositol alongside chemotherapy, reporting better quality of life and fewer chemotherapy side effects in around 14 patients. That is hypothesis-generating, not evidence of an anticancer effect, and no phase III trial has been completed.

  • Chelates iron and acts as an antioxidant Moderate evidence

    Phytic acid's core chemistry is strong chelation of iron, zinc, calcium and magnesium, which suppresses iron-catalyzed hydroxyl radical formation. This is a real and reproducible mechanism, and it plausibly underlies both the antioxidant claim and the anticancer hypothesis. The same property is why phytate reduces non-heme iron absorption by 50-80% at doses found in a legume-heavy meal.

  • Reduces kidney stone formation Limited evidence

    Phytate inhibits calcium oxalate and calcium phosphate crystallization in vitro and in urine, and observational data associate higher dietary phytate with lower stone risk in women. Supplement trials with stone-recurrence endpoints are lacking, so this remains a plausible but unproven use.

  • Depletes minerals with long-term use Moderate evidence

    This is the flip side of the mechanism. In food science phytic acid is the classic antinutrient, and reducing it is a stated goal of food processing in iron- and zinc-deficient populations. Taking gram doses of isolated IP-6 on an empty stomach reduces the collision with food minerals but does not eliminate concern with chronic use, particularly for iron and zinc status.

Dosage & safety

Studied doseSupplement labels typically supply 800-2000 mg/day IP-6, often paired with 200-500 mg myo-inositol in a 4:1 ratio, taken on an empty stomach away from food and mineral supplements. The small clinical pilots used roughly 4.8-6 g/day IP-6 plus 1.2-1.5 g inositol. Dietary phytate intake from a whole-food diet is around 0.3-2 g/day.
SafetyGenerally well tolerated short-term; GI upset is the common complaint. The main concern is mineral depletion — reduced absorption of iron, zinc, calcium and magnesium with chronic gram-level dosing. Avoid or monitor closely if you have iron-deficiency anemia, osteoporosis, or are a menstruating woman, vegetarian, or child. May potentiate the effect of anticoagulants and should be discussed with an oncologist before use during chemotherapy or radiotherapy, since antioxidant and chelating agents can theoretically interact with treatments that depend on oxidative damage. Not established in pregnancy. IP-6 is not an approved cancer treatment anywhere and should never replace one.

Scientific references

Where to buy

Nature's Way, Cell Forté, IP-6 & Inositol, 240 Vegan Capsules

View on iHerb

Referral link — this site may earn a commission on purchases.

Related in Longevity & antioxidants