Supplement analysis backed by scientific evidence · PT

← All supplements
Limited evidenceGeneral health

Modified Citrus Pectin

Modified citrus pectin is a depolymerized pectin that binds galectin-3, and single-arm trials in biochemically relapsed prostate cancer show PSA doubling-time changes worth further study. The heavy-metal detox claims rest on studies of seven people and should not be mistaken for chelation therapy.

What the science says

  • PSA kinetics signal in relapsed prostate cancer — but uncontrolled Limited evidence

    A prospective phase II study of men with non-metastatic biochemically relapsed prostate cancer given 4.8 g modified citrus pectin three times daily (14.4 g/day) reported that a majority had stable or improved PSA doubling time at 6 and 18 months, with good tolerability. There was no control arm, PSA doubling time is a surrogate rather than a survival endpoint, and no randomized trial has confirmed the finding.

  • Galectin-3 inhibition is a real mechanism with unproven clinical payoff Limited evidence

    The low-molecular-weight, low-esterification fragments in MCP bind the carbohydrate-recognition domain of galectin-3, a protein implicated in fibrosis, inflammation and tumour cell adhesion. Mechanistic plausibility is good; human trials showing changes in fibrosis, cardiac or renal outcomes are essentially absent.

  • Heavy metal excretion data are extremely thin Limited evidence

    The frequently cited study enrolled just seven healthy subjects who took 15 g/day of MCP for five days, reporting increased urinary excretion of arsenic, cadmium and lead without depleting essential minerals. A separate open-label report described falling blood lead in children hospitalized with lead poisoning. Neither is controlled, and neither justifies substituting MCP for established chelation in documented poisoning.

  • Immune claims are preclinical Limited evidence

    NK-cell activation and cytokine effects have been reported in laboratory and small ex vivo work, but no adequately powered human trial has shown improved immune outcomes, infection rates or cancer survival with MCP.

Dosage & safety

Studied doseProstate studies used 4.8 g three times daily (14.4 g/day) of a standardized low-molecular-weight preparation (PectaSol-C type), taken between meals for 6-18 months. The heavy-metal excretion study used 15 g/day for five days. Ordinary fruit pectin is not equivalent — molecular weight and degree of esterification determine galectin-3 binding, so unmodified pectin should not be substituted. Powder mixed in water is more practical than capsules at these doses.
SafetyGenerally well tolerated at gram doses; the main effects are bloating, flatulence, loose stools and a feeling of fullness. As a soluble fiber it can slow or reduce absorption of oral medications and minerals — separate by at least 2 hours, and be cautious with narrow-therapeutic-index drugs. Citrus allergy is a contraindication. Not established as safe in pregnancy or breastfeeding. Not banned in sport. Two framing points matter: MCP is not a substitute for prescription chelation therapy in confirmed lead, mercury or arsenic poisoning, and it is not a treatment for prostate cancer — any use alongside oncology care should be disclosed to the treating oncologist, since a rising PSA requires proper staging and treatment decisions.

Scientific references

Where to buy

Econugenics, PectaSol® Modified Citrus Pectin, 16 oz (454 g)

View on iHerb

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

Related in General health