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Collagen supplements and Breast Cancer: Is it safe?

Posted by anjalima @anjalima, Oct 20, 2022

I contacted a nutritionist regarding information on staying healthy after a breast cancer diagnosis. One of the recommended supplements is a collagen supplement drink in the morning.

I actually took this for a week but recently learned that it may promote breast cancer in dense breasts and facilitate a route for metastatic breast cancer.

Any information out there from our oncologists ?

If anyone can recommend an oncology nutritionist in the NYC metro area please personal message me . Thank you.

Interested in more discussions like this? Go to the Breast Cancer Support Group.

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ver | @ver | Jan 7 11:24pm
In reply to @cathd "I have been researching this topic - wondering if any of our wise minds here have..." + (show)
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I have been researching this topic - wondering if any of our wise minds here have anything to offer about collagen peptides.

Admittedly researchers are still unsure exactly how BC metastasizes - although they have many observations. One is that the cancer cells crawl along collagen fibers and spread from collagen fiber to collagen fiber, thus infiltrating different areas of the body. This is probably why it is recommended to stay away from collagen supplements. Cancer cells can also wrap themselves in collagen fibers to hide and survive treatments. And yet other studies suggest collagen may be beneficial.

Having said all of this, something doesn't make sense to me. When we consume collagen supplements, we are not eating collagen fibers that later migrate to find themselves arranged into breast tissue or elsewhere. We are simply consuming the nutrients necessary to enable our bodies to rearrange them into protein molecules for use throughout the body. We are simply consuming more protein - which in turn causes us to create more collagen everywhere in the body.

Collagen holds the body together and gives us better joints, muscles, skin, etc. (Or - protein holds the body together - same thing.) Would it not follow, then (according to the anti-collagen theory), that we should limit protein so that we have just enough to hold the body together, but not enough "extra" to make collagen fibers available to the cancer? Would that really make any sense? Am I missing something here?

Also, I would think that some women have dense breasts more in response to their hormones than to protein consumption.

Why do collagen supplements get the bad rap - and not protein in general?

Thank you in advance for any comments!

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@cathd I think a collagen supplement caused my breast cancer to return after 8 years. Be careful using products containing them.

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ver | @ver | Jan 7 11:28pm
In reply to @songfamily2025 "@susan7656 Hi, It "s interesting to read your article. I had dense breasts, Also used collage..." + (show)
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@susan7656 Hi, It "s interesting to read your article. I had dense breasts, Also used collage for many years. In Aug. 2024 I was diagnosed left side breast cancer and in Nov 2024 I had a mastectomy. I was 68 year old. I didn't request a reconstruction. My Onco Score was 22. No chemo needed. My tumor was ER+PR+Her2- . I am on Letrozole for 5 year.
I quit taking the collagen after the diagnosis. Now I am taking Naked Whey Protein and AlgaeCal approved by my oncologist. Sometime I blame myself that I should do more research with collagen. But most of the time. I don't feel sorry for taking it. There is no evidence to prove the collagen can cause the cancer.

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@songfamily2025 I believe collagen supplement made my cancer return after 8 years.

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prarysky | @prarysky | Jan 8 9:52am

I attended an online program with a nutritionist who specializes in cancer. I believe she said she was cautious about breast cancer patients taking collagen. It is a very popular supplement in general but also within the breast health community where we are anxious to provide any supplements which may help us.

I think that the caution may mostly apply to breast cancer patients who are estrogen positive. As someone who is estrogen positive, I am not taking collagen at this time despite the appeal of many of its claim. I wish there were more studies we could rely on to guide us.

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maymore | @maymore | Jan 8 10:35am

As of early 2026, there is no direct scientific evidence that consuming dietary collagen supplements (powders, pills, or drinks) causes breast cancer or increases the risk of it developing.
Digestion Factor: When ingested, collagen is broken down by the digestive system into smaller peptides and amino acids; there is no proof these peptides trigger cancer.
Lack of Clinical Trials: Scientific groups like the American Cancer Society do not list collagen supplements as a known risk factor. However, experts note this may be due to a lack of long-term human studies specifically investigating this link.
Theoretical Concerns: Some researchers suggest caution for individuals with ER-positive (estrogen-sensitive) breast cancer, as animal studies (not human) have shown that high levels of Type I collagen might influence hormonal signaling. Additionally, some supplements may contain high calcium levels, which could theoretically influence estrogen, though this is not yet substantiated.

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