Cancer becomes most dangerous when it spreads from its original location to other parts of the body—a process called metastasis. This spreading relies on certain proteins called lectins, which act like molecular “velcro” helping cancer cells stick together and communicate with each other.¹ 

One particular type of lectin—called galectin-3 (Gal-3)—has captured researchers’ attention because it plays a key role in how several types of cancers spread, including breast, prostate, and colon cancer.^2,3 Blood levels of galectin-3 closely track with cancer progression, making it a valuable marker for doctors to monitor how well treatments are working.

What is Modified Citrus Pectin?

Modified citrus pectin (MCP) is a natural substance extracted from the peel and pulp of citrus fruits like oranges, lemons, and grapefruits. Unlike regular pectin used in cooking, MCP is specially processed to break down into smaller molecules that can be better absorbed by the body.⁴ 

Scientists have discovered that MCP can block galectin-3, potentially interfering with cancer’s ability to spread.⁵ This blocking mechanism is like removing the “velcro” that cancer cells use to stick together and attach to other tissues in the body.

MCP produces multiple effects, including but not limited to its antagonism of galectin-3, which have shown benefit in preclinical and clinical models. Regarding cancer, MCP modulates several rate-limiting steps of the metastatic cascade. MCP can also affect cancer cell resistance to chemotherapy.⁶ 

How MCP Works Against Cancer

When cancer cells break away from their original tumor, they travel through the bloodstream until becoming trapped in small blood vessels. There, they use galectin-3 to attach to the blood vessel walls, penetrate through them, and establish new tumor colonies.^7,8 

MCP appears to interrupt this process by binding to galectin-3 on cancer cells, preventing them from attaching to blood vessel walls and blocking their ability to form new tumor colonies.⁹ This interference happens without harming normal cells.

¹⁰

Research on MCP and Different Cancers

Prostate Cancer

Several studies show promising results for MCP in prostate cancer:

• In laboratory studies, MCP prevented prostate cancer cells from attaching to other cells, a critical step in metastasis.¹¹ 
• In animal studies, rats given MCP had significantly fewer lung metastases compared to untreated animals.¹² 
• In a human study, 70% of men with rising PSA levels (a prostate cancer marker) showed significant slowing in their PSA doubling time after taking MCP for 12 months.¹³ 
• An 18-month clinical trial found that 85% of participants with early-stage prostate cancer showed positive results with MCP treatment, including slower cancer progression markers and no visible spread.¹⁴ 

Researchers conducted a study on men with early-stage prostate cancer who had rising PSA levels (a blood marker for prostate cancer) after initial treatment but no visible spread of cancer. This condition, while not immediately life-threatening, often leaves patients and doctors uncertain about the best treatment approach.

In this study:

• Patients took PectaSol® (a specific brand of modified citrus pectin) three times daily for 18 months.
• After the full treatment period, 85% of patients showed positive results.
• 62% had PSA levels that either decreased or remained stable.
• 90% showed improvement in how quickly their PSA levels were rising (slower increases are better).
• All patients remained free of visible cancer spread.
• No serious side effects were reported.¹⁵ 

Breast Cancer

Research shows that MCP may help prevent breast cancer cells from spreading:

• Laboratory studies demonstrate that MCP blocks breast cancer cells from adhering to blood vessel walls.^16,17 
• Higher grades of invasive breast cancer show increased galectin-3 expression, suggesting MCP could be particularly beneficial.¹⁸ 
• A systematic review of studies over 22 years found positive results for MCP against breast cancer in both laboratory and animal studies.¹⁹ 

Other Cancers

MCP has also shown promise with:

• Melanoma: In one animal study, MCP decreased tumor spread to the lungs by more than 90%.²⁰ 
• Colon Cancer: MCP effectively inhibited liver metastasis in laboratory models.²¹ 
• Ovarian Cancer: Studies show MCP increases the effectiveness of standard chemotherapy drugs.²² 
• Bladder cancer: MCP inhibited bladder cancer tumor development by causing cell cycle arrest and death in vitro and in vivo. In high-quality bladder cancer samples, MCP reduced the expression of Gal-3, which has functions related to cell proliferation, survival, adhesion, and metastasis.^23,24 

Illustration representing the site of action of modified citrus pectin and associated pectins in cancer treatment.²⁵ 

Beyond Cancer: Other Health Benefits

• Kidney Health: Research shows MCP reduces kidney injury and protects against damage from diabetes.^26,27 
• Myocardial fibrosis (MF) plays a key role in the development and progression of heart failure (HF) with limited effective therapies. Galectin-3 (Gal-3) is a biomarker associated with fibrosis and inflammation in patients with HF. MCP protects against cardiac dysfunction, through downregulating Gal-3 expression and suppressing activation of pro-inflammatory signaling pathway.²⁸ 
• Anti-inflammatory Effects: MCP appears to reduce harmful inflammation throughout the body.²⁹ 
• Potential for Combination Therapy: MCP may enhance conventional cancer treatments with minimal side effects.^30-32 
• Heavy Metal Detoxification: MCP binds to and enhances excretion of toxic metals like lead, mercury, arsenic, and cadmium without depleting essential minerals.
• Immunomodulation: Activates T-cells and NK cells involved in anti-cancer immunity.
• Gastrointestinal Health: Supports healthy gut bacteria by providing fermentable Prebiotic fiber.
• Cell adhesion inhibition: Prevents pathogen cell adhesion to tissues. Many bacteria form biofilms that prevent immune system access to these chronic infections. MCP is able to break up these biofilms to allow the immune system to better combat the infection.
• Potential Neuroprotective Effects (early research): Galectin-3 has been implicated in neurodegeneration, and MCP may help by reducing neuroinflammation.

Safety and Side Effects

MCP is generally well-tolerated, even at high doses. Since it’s a soluble fiber, the most common side effect is occasional loose stools, which typically resolves without stopping treatment. The FDA categorizes MCP as “Generally Recognized as Safe” (GRAS).^33,34 

Recommended Dosage

Typical adult dosages range from 6-30 grams daily, taken in divided doses. In clinical studies showing benefits for prostate cancer, doses of approximately 15 grams per day were used.^35,36 The powder is usually dissolved in water or juice.

These results are encouraging because they suggest that modified citrus pectin, a natural food supplement considered safe by the FDA, might offer a gentle yet effective option for inhibiting or slowing down cancer growth without significant toxicity.³⁷ 

Further Reading

If you would like to take a deeper dive into learning more about Modified Citrus Pectin and Galectin-3 and their health effects, Dr Isaac Eliaz has written a book called The Survival Paradox: Reversing the Hidden Cause of Aging and Chronic Disease, Dr Eliaz reveals how the body’s innate survival response, while essential for immediate protection, can, when chronically activated, lead to inflammation, disease progression, and premature aging. Drawing on decades of clinical experience and scientific research, he introduces the concept of Galectin-3 as a key biomarker and driver of this survival response. Through practical tools, including detoxification, targeted nutrition, stress reduction, and the use of Modified Citrus Pectin, Dr Eliaz teaches how to calm the body’s survival mode and activate its natural healing potential.

Conclusion

Modified citrus pectin (MCP) offers a promising and natural way to help fight the spread of cancer and other conditions. By blocking galectin-3, MCP can interfere with how cancer cells grow, stick to each other, and travel through the body. Research shows that MCP may slow down or even stop cancer progression in several types of cancer, including prostate, breast, and colon cancers. It also appears to support kidney, heart, and immune system health, while helping the body safely remove toxic heavy metals. Best of all, MCP is well-tolerated, safe for most people, and can be used alongside other cancer treatments. As science continues to explore the benefits of MCP, it’s on its way to becoming an important part of a well-rounded plan to reverse chronic disease.

References:

1. Raz a, Loton R. Endogenous galactoside-binding lectins: a new class of functional cell surface molecules related to metastasis. Cancer Metastasis Rev 1987;6:433-452.
2. Idikio H. Galectin-3 expression in human breast carcinoma: correlation with cancer histologic grade. Int J Oncol 1998;12:1287-1290.
3. Nangia-Makker P, et al. Galectin-3 induces endothelial cell morphogenesis and angiogenesis. Am J Pathol 2000;156:899–909.
4. Nicolson GL. Cancer metastasis: tumor cell and host organ properties important in metastasis in a rat prostate cancer model by oral administration of modified citrus pectin. J Natl Cancer Inst 1995;87:348-353.
5. Gao X, Zhi Y, Zhang T, Xue H, Wang X, Foday AD, Tai G, Zhou Y. Analysis of the neutral polysaccharide fraction of MCP and its inhibitory activity on galectin-3. Glycoconj J. 2012 May;29(4):159-65.
6. Eliaz I, Raz A. Pleiotropic Effects of Modified Citrus Pectin. Nutrients. 2019 Nov 1;11(11):2619. doi: 10.3390/nu11112619. PMID: 31683865; PMCID: PMC6893732.
7. Raz a, Loton R. Endogenous galactoside-binding lectins: a new class of functional cell surface molecules related to metastasis. Cancer Metastasis Rev 1987;6:433-452.
8. Nicolson GL. Cancer metastasis: tumor cell and host organ properties important in metastasis in a rat prostate cancer model by oral administration of modified citrus pectin. J Natl Cancer Inst 1995;87:348-353.
9. Naik H, Pilat MF, donat T, et al. Inhibition of in vitro tumor cell-endothelial adhesion by modified citrus pectin: a pH modified natural complex carbohydrate. Proc Am Assoc Cancer Res 1995:36:Abstract 377.
10. Glinsky VV, Raz A. Modified citrus pectin anti-metastatic properties: one bullet, multiple targets. Carbohydr Res. 2009 Sep 28;344(14):1788-91. doi: 10.1016/j.carres.2008.08.038. Epub 2008 Sep 26. PMID: 19061992; PMCID: PMC2782490.
11. Pienta KF, Naik H, Akhtah A, et al. Inhibition of spontaneous metastasis in a rat prostate cancer model by oral administration of modified citrus pectin. J Natl Cancer Inst 1995;87:348-353.
12. Pienta KF, Naik H, Akhtah A, et al. Inhibition of spontaneous metastasis in a rat prostate cancer model by oral administration of modified citrus pectin. J Natl Cancer Inst 1995;87:348-353
13. Brad Guess, Mark Scholz, Richard Lam and Henry Johnson. Modified citrus pectin (MCP) increases the prostate-specific antigen doubling time in men with prostate cancer: a phase II pilot study. Prostate Cancer Prostatic Dis. 2003;6(4):301-4.
14. Keizman D, Frenkel M, Peer A, et al. Modified Citrus Pectin Treatment in Non-Metastatic Biochemically Relapsed Prostate Cancer: Long-Term Results of a Prospective Phase II Study. Nutrients. 2023 Aug 11;15(16):3533.
15. Keizman D, Frenkel M, Peer A, Rosenbaum E, Sarid D, Leibovitch I, Mano R, Yossepowitch O, Wolf I, Geva R, Margel D, Rouvinov K, Stern A, Dresler H, Kushnir I, Eliaz I. Modified Citrus Pectin Treatment in Non-Metastatic Biochemically Relapsed Prostate Cancer: Long-Term Results of a Prospective Phase II Study. Nutrients. 2023 Aug 11;15(16):3533. doi: 10.3390/nu15163533. PMID: 37630724; PMCID: PMC10459199.
16. Naik H, Pilat MF, donat T, et al. Inhibition of in vitro tumor cell-endothelial adhesion by modified citrus pectin: a pH modified natural complex carbohydrate. Proc Am Assoc Cancer Res 1995:36:Abstract 377.
17. Glinsky VV, Huflejt ME, Glinsky GV, et al. Effects of Thomsen-Friedenreich antigen-specific peptide P-30 on beta-galatoside-mediated homotypic aggregation and adhesion to the endothelium of MDA-MB-435 human breast carcinoma cells. Cancer Res 2000;60:2584-2588.
18. Idikio H. Galectin-3 expression in human breast carcinoma: correlation with cancer histologic grade. Int J Oncol 1998;12:1287-1290.
19. Garrido G, Garrido-Suárez BB, Mieres-Arancibia M, et al. Modified pectin with anticancer activity in breast cancer: A systematic review. Int J Biol Macromol. 2024 Jan;254(Pt 1):127692.
20. Platt D, Raz A. Modulation of the lung cell colonization of B16-F1 melanoma cells by citrus pectin. J Natl Cancer Inst 1992;18:438-442.
21. Nangia-Makker P, et al. Galectin-3 induces endothelial cell morphogenesis and angiogenesis. Am J Pathol 2000;156:899–909.
22. Hossein G, Keshavarz M, Ahmadi S, Naderi N. Synergistic Effects of PectaSol-C Modified Citrus Pectin an Inhibitor of Galectin-3 and Paclitaxel on Apoptosis of Human SKOV-3 Ovarian Cancer Cells. Asian Pac J Cancer Prev. 2013;14(12):7561-8.
23. Cardoso A.C.F., Andrade L.N.d.S., Bustos S.O., Chammas R. Galectin-3 determines tumor cell adaptive strategies in stressed tumor microenvironments. Front. Oncol. 2016;6:6. doi: 10.3389/fonc.2016.00127.
24. Wang L., Guo X.L. Molecular regulation of galectin-expression and therapeutic implication in cancer progression. Biomed. Pharmacother. 2016;78:165–171. doi: 10.1016/j.biopha.2016.01.014
25. Emran TB, Islam F, Mitra S, Paul S, Nath N, Khan Z, Das R, Chandran D, Sharma R, Lima CMG, Awadh AAA, Almazni IA, Alhasaniah AH, Guiné RPF. Pectin: A Bioactive Food Polysaccharide with Cancer Preventive Potential. Molecules. 2022 Oct 31;27(21):7405. doi: 10.3390/molecules27217405. PMID: 36364232; PMCID: PMC9657392.
26. Mahmoud HM, Abdel-Razik AH, Elrehany MA, et al. Modified Citrus Pectin (MCP) Confers a Renoprotective Effect on Early-Stage Nephropathy in Type-2 Diabetic Mice. Chem Biodivers. 2024 Jul;21(7):e202400104.
27. Kolatsi-Joannou M, Price KL, Winyard PJ, Long DA (2011) Modified Citrus Pectin Reduces Galectin-3 Expression and Disease Severity in Experimental Acute Kidney Injury. PLoS ONE 6(4): e18683.
28. Xu GR, Zhang C, Yang HX, Sun JH, Zhang Y, Yao TT, Li Y, Ruan L, An R, Li AY. Modified citrus pectin ameliorates myocardial fibrosis and inflammation via suppressing galectin-3 and TLR4/MyD88/NF-κB signaling pathway. Biomed Pharmacother. 2020 Jun;126:110071. doi: 10.1016/j.biopha.2020.110071. Epub 2020 Mar 12. PMID: 32172066.
29. Kolatsi-Joannou M, Price KL, Winyard PJ, Long DA (2011) Modified Citrus Pectin Reduces Galectin-3 Expression and Disease Severity in Experimental Acute Kidney Injury. PLoS ONE 6(4): e18683.
30. Leclere L, Cutsem PV, Michiels C. Anti-cancer activities of pH- or heat-modified pectin. Front Pharmacol. 2013 Oct 8;4:128.
31. Yan J, Katz A. PectaSol-C modified citrus pectin induces apoptosis and inhibition of proliferation in human and mouse androgen-dependent and-independent prostate cancer cells. Integr Cancer Ther. 2010;9:197–203.
32. Glinsky VV, Raz A. Modified citrus pectin anti-metastatic properties: one bullet, multiple targets. Carbohydr Res. 2009 Sep 28;344(14):1788-91. doi: 10.1016/j.carres.2008.08.038. Epub 2008 Sep 26. PMID: 19061992; PMCID: PMC2782490.
33. Strum S, Scholz M, McDermed J, et al. Modified citrus pectin slows PSA doubling time: A pilot clinical trial. Presentation: International conference on diet and Prevention of Cancer, Tampere, Finland. May 28, 1999-June 2, 1999.
34. Keizman D, Frenkel M, Peer A, et al. Modified Citrus Pectin Treatment in Non-Metastatic Biochemically Relapsed Prostate Cancer: Long-Term Results of a Prospective Phase II Study. Nutrients. 2023 Aug 11;15(16):3533.
35. Strum S, Scholz M, McDermed J, et al. Modified citrus pectin slows PSA doubling time: A pilot clinical trial. Presentation: International conference on diet and Prevention of Cancer, Tampere, Finland. May 28, 1999-June 2, 1999.
36. Brad Guess, Mark Scholz, Richard Lam and Henry Johnson. Modified citrus pectin (MCP) increases the prostate-specific antigen doubling time in men with prostate cancer: a phase II pilot study. Prostate Cancer Prostatic Dis. 2003;6(4):301-4.
37. Keizman D, Frenkel M, Peer A, Rosenbaum E, Sarid D, Leibovitch I, Mano R, Yossepowitch O, Wolf I, Geva R, Margel D, Rouvinov K, Stern A, Dresler H, Kushnir I, Eliaz I. Modified Citrus Pectin Treatment in Non-Metastatic Biochemically Relapsed Prostate Cancer: Long-Term Results of a Prospective Phase II Study. Nutrients. 2023 Aug 11;15(16):3533. doi: 10.3390/nu15163533. PMID: 37630724; PMCID: PMC10459199.