Supplement analysis backed by scientific evidence · PT · ES · DE · FR

← 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.

View on iHerb Ships to 180+ countries · welcome discount for new customers

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.

How to take it

TimingOn an empty stomach, at least 2 hours from meals and mineral supplements.
With food?Without food — taken with a meal it binds the iron, zinc and calcium in that meal.
Worth knowingIf you are a menstruating woman, vegetarian, child or already low on iron, this is the wrong supplement for you; mineral depletion is its central, predictable effect.

Interactions

With medications

  • warfarin, DOACs and antiplatelet drugs

    IP-6 may add to their anticoagulant effect do not combine without your prescriber's approval

  • chemotherapy and radiotherapy

    antioxidant and metal-chelating agents may interfere with treatments that depend on oxidative damage discuss with your oncologist before use — IP-6 is not an approved cancer treatment anywhere

With other supplements

  • iron supplements

    phytate strongly binds iron and blocks its absorption separate by at least 2 hours, and avoid IP-6 entirely if you are iron deficient

  • zinc supplements

    phytate chelates zinc and reduces absorption take zinc at least 2 hours apart

  • calcium and magnesium supplements

    chronic gram-level phytate reduces absorption of both separate by at least 2 hours and monitor if you have osteoporosis

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does IP-6 fight cancer?

The evidence for IP-6 is limited to cell and animal studies plus small pilot studies in humans, including one of around 14 colorectal cancer patients. No phase III trial has been completed, and IP-6 is not an approved cancer treatment anywhere.

Can IP-6 cause mineral deficiencies?

Yes. IP-6 is phytic acid, which strongly binds iron, zinc, calcium and magnesium, and chronic gram-level dosing reduces their absorption. Avoid it or monitor closely if you have iron-deficiency anemia or osteoporosis, or are a menstruating woman, vegetarian or child.

How should IP-6 be taken?

IP-6 is taken on an empty stomach, at least 2 hours from meals and mineral supplements; labels typically supply 800-2000 mg/day, often with myo-inositol. Taken with food, IP-6 binds the minerals in that meal.

Does IP-6 prevent kidney stones?

The evidence for IP-6 against kidney stones is limited: phytate inhibits crystal formation in the lab and higher dietary phytate is linked to lower stone risk in women, but no supplement trial has measured stone recurrence.

Scientific references

Where to buy

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

View on iHerb

Ships to 180+ countries · welcome discount for new customers

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

Related in Longevity & antioxidants