Modified citrus pectin (MCP) is a soluble fiber that has been processed in such a way that it can be absorbed -- and as a supplement, has been promoted for "detoxification," "cellular health," and preventing or slowing cancer growth, such as in prostate and breast cancer tumors. It is commonly sold as Pectasol® and PectaSol-C® (see our Where to Buy page for our list of retailers that sell modified citrus pectin that we've found to be reputable). While some preliminary evidence suggests a possible benefit, this evidence is far from definitive -- and there can be mild side effects. See the full answer to get the details about MCP >>

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September 1, 2019

I have been taking modified citrus pectin daily since being diagnosed with a breast tumor. I declined conventional treatments and for 10 years the tumor has remained localized. I am very grateful that my oncologist told me about it ten years ago.
October 21, 2019

Thank you for sharing this Esther. As discussed in the answer above, the evidence for this use is very preliminary.

August 17, 2020

Which MCP brand do you use?

June 10, 2019

Hello, Eugenics Pectasol-C is labeled with warning:
"This product contains a chemical known to the State of California to cause cancer, birth defects, or..."
Do you know why? Is it safe?
June 10, 2019

Eugenics Pectasol-C may contain an amount of lead that exceeds the strict limit in California, above which a warning label is required. This is suggested by information on the website of that product. We have not tested this product, so, unfortunately, we don't know the actual amount of lead it contains.

MAX 155
September 10, 2014

According to LIFE EXTENSION, MCP is also effective in Congestive Heart Failure cases in that it stops the remodeling of the heart. This is a subject of the October 2014 issue.

November 14, 2016

A recent study reported in Nature found that ingestion of Modified citrus pectin significantly reduced insulin resistance and its effects.
November 14, 2016

Hi Nalani - Thanks for sharing that study. However, please be aware that it is based on an animal experiment, not a study in people. This has not yet been demonstrated in people.

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