Image Credit: Pixabay. This image has been modified.

The Downside of Curcumin Supplements

Supplement manufacturers often fall into the same reductionist trap as the drug companies. Herbs are assumed to have only one main active ingredient, so, as the thinking goes, if you can isolate and purify it into a pill, you can boost its effects. Curcumin is described as the active ingredient in turmeric, but is it the active ingredient or just an active ingredient? It is just one of many different components—more than 300, in fact—of the whole food spice.

“Only limited studies have compared the potential of turmeric with curcumin.” Some, however, suggest turmeric, the whole food, may work even better—and not just against colon cancer cells. As I discuss in my video Turmeric or Curcumin: Plants vs. Pills, researchers at the Anderson Cancer Center in Texas pitted both curcumin and turmeric against seven different types of human cancer cells in vitro.

The study found that curcumin kicks tush against breast cancer cells, but turmeric, the whole food, kicks even more. In addition to breast cancer, the researchers found that turmeric was more potent compared to curcumin against pancreatic cancer, colon cancer, multiple myeloma, myelogenous leukemia, and colorectal cancer cells, “suggesting that components other than curcumin can also contribute to anti-cancer activities.”

Most clinical studies treating diseases in people have used curcumin supplements, as opposed to turmeric, but none has tried using turmeric components other than curcumin, even though curcumin-free turmeric exhibits anti-inflammatory and anticancer activities.

“Although curcumin is believed to account for most activities of turmeric, research over the past decade has indicated that curcumin-free turmeric”—that is, turmeric with the so-called active ingredient removed—“is as effective as or even more effective than curcumin-containing turmeric.” There are turmerones, for example, in turmeric, which may exhibit both anticancer activities, as well as anti-inflammatory activities, but these turmerones are processed out of curcumin supplements. So, I assumed this review would conclude by stating we should stop giving people curcumin supplements and instead just give them the whole food spice turmeric, but instead the researchers proposed that we make all sorts of different turmeric-derived supplements!

That’s quite a rebut to reductionism. For more on this flawed nutritional philosophy, see my video Reductionism and the Deficiency Mentality.

Similar videos in this vein include:

Interested in learning more about turmeric and cancer? See:

And for more on turmeric and everything else:

In health,
Michael Greger, M.D.

PS: If you haven’t yet, you can subscribe to my free videos here and watch my live, year-in-review presentations:


Michael Greger M.D., FACLM

Michael Greger, M.D. FACLM, is a physician, New York Times bestselling author, and internationally recognized professional speaker on a number of important public health issues. Dr. Greger has lectured at the Conference on World Affairs, the National Institutes of Health, and the International Bird Flu Summit, testified before Congress, appeared on The Dr. Oz Show and The Colbert Report, and was invited as an expert witness in defense of Oprah Winfrey at the infamous "meat defamation" trial.

64 responses to “The Downside of Curcumin Supplements

Comment Etiquette

On, you'll find a vibrant community of nutrition enthusiasts, health professionals, and many knowledgeable users seeking to discover the healthiest diet to eat for themselves and their families. As always, our goal is to foster conversations that are insightful, engaging, and most of all, helpful – from the nutrition beginners to the experts in our community.

To do this we need your help, so here are some basic guidelines to get you started.

The Short List

To help maintain and foster a welcoming atmosphere in our comments, please refrain from rude comments, name-calling, and responding to posts that break the rules (see our full Community Guidelines for more details). We will remove any posts in violation of our rules when we see it, which will, unfortunately, include any nicer comments that may have been made in response.

Be respectful and help out our staff and volunteer health supporters by actively not replying to comments that are breaking the rules. Instead, please flag or report them by submitting a ticket to our help desk. is made up of an incredible staff and many dedicated volunteers that work hard to ensure that the comments section runs smoothly and we spend a great deal of time reading comments from our community members.

Have a correction or suggestion for video or blog? Please contact us to let us know. Submitting a correction this way will result in a quicker fix than commenting on a thread with a suggestion or correction.

View the Full Community Guidelines

    1. It is an allergen for me too. My scalp becomes dry, crustations develop on my scalp and bumps on my forehead when I take tumeric powder regularly.

      1. That raises a tough question about a lot of dietary and pharmacological interventions – How regular and consistent do they have to be? Depending on the situation, perhaps we should give more consideration to periodic or short-term “treatment” ? I suppose that is something that can really be addressed only on an individual level, the variables are so many and we still know so little of the mechanisms involved.

        Of course your particular situation does suggest that complete avoidance is the wise choice!

    1. You are right, Christine!

      When I was young, I was allergic to so many skin care products that they would tell my parent’s to use things like baby oil and I was seriously allergic to baby oil.

      I thought that was bad, but my cousin and close friend are allergic to saline.

      I thought that was bad, but I saw a little girl who was allergic to water, even her own tears, and could not be bathed, and could not cry about it.

      1. The idea of an allergy to water really strains my credulity to an extreme. Virtually everything we eat contains water. The human body is largely water. How could someone be allergic to it? If they were in fact allergic, how could they live??

        Meaning no disrespect, but this sounds like a tall tale that someone passed to you on April Fools Day!

              1. Right you are. There is a hierarchy of reliability in Google results, just as there is for “research”.

                As far as the oxygen allergy goes, it’s real too. It presents when your body can no longer absorb and process oxygen. I believe the technical term is “death” :P

          1. Actually, the person I watched a video on was not the same as this girl. This one didn’t have it internally. The one I saw couldn’t drink water.

            As of 2015, there were 35 people known to have it. There is at least one more.

          2. That really is a sad case. The vid does not say if it has been considered, but I wonder if something in their more than hundred year old house may be exacerbating the condition. One obvious factor could be buildup of contaminants in the old water pipes. Sorry if I’ve digressed a long way from turmeric!

        1. That or a psychosomatic reaction. If you could somehow test without their perceiving water and there was no reaction, then the self-diagnosis of allergy would be disproven.
          Any irritation or any degree of reaction gets labeled allergy pretty carelessly, forgetting that there can be other mechanisms going on. So my first thought is always, How was this diagnosed?

  1. Problem is finding fresh turmeric.Living in the mountains of Southeast Brazil, I can find it easily during eight months of the year. The other 4 unfortunatelly, only by supplement

    1. Then during the eight months that you are blessed to have fresh root, dry & powder some, put it into capsules and you have supplements for the other four months.

      1. Do we have evidence that the dried and powdered turmeric that many of us can get at any grocery is significantly inferior to the “fresh” product ? Are we perhaps falling victim to an unjustified assumption that in this case “fresh” is sufficiently superior to justify efforts to obtain it? I don’t ever recall seeing “fresh” turmeric.

        1. My issue with powdered turmeric is that it seems frequently to be contaminated
          with, in particular, lead.

          “In the past several years, 13 brands of lead-contaminated turmeric have been recalled, all voluntarily. In 2011, companies based in Missouri and California initiated recalls of Archer Farms10 and Spice Hunter11 ground turmeric sold at stores nationwide because of excessive lead levels. Later that year, an online distributor recalled a powder-based dietary turmeric supplement (Dr Clark brand), which had been sold throughout the United States, Canada, Japan, Korea, and the United Kingdom.12 These recalls were followed by the voluntary recall of Pran ground turmeric in 2013 by 4 companies based in New York,13,14 Texas,15 and Michigan.16”

          1. Fresh tumeric is not always available locally. So I order powered organic tumeric that has been third party tested for lead. Most companies make that info known. I use tumeric every day in foods.
            However, for headaches, etc., I take meriva curcumin along with ginger and sometimes boswellia (frankincense), which is more effective for that.
            I don’t do aspirin, ibuprofen type drugs.

        2. I can buy fresh turmeric in any grocery store in Mazatlan, Mexico and in many grocery stores (certainly whole foods) in USA. I generally put it everything from My morning oatmeal to spaghetti sauce.

  2. If allergic or other negative reactions to turmeric can be managed by isolating the acrive ingredient needed for a particular problem, that is surely a good thing.

    However, from the very brief mention in the blog, it would seem that reducing turmeric to a large number of active ingredients and marketing them individually is merely reductionist fragmentation designed to create a new or larger market for pills.

    1. You can cook with it, turmeric powder has a warm, bitter, black pepper-like flavor and earthy, mustard-like aroma.* I add fresh root and powdered to my smoothies. It’s wonderful on curries and rices. Some drink it as a tea or as warm golden milk. Don’t like the flavor, get some good organic ground turmeric and black pepper, mix together at a 10:1 ratio and put it into capsules.Swallow as needed. :)

      *Flavoe description stolen from Wikipedia. I couldn’t think of how to describe it.

        1. Roots are great too when you can get them. I started growing the rhizomes a few years ago, along with ginger, and they are both great in smoothies.

  3. .
    I’d only take supplements that are certified by United States Pharmacopeia; USP will be on the container. As you may kno, the US FDA, Food & Drug Admin, has been made by the industry to give up jurisdiction over supps, so w/o USP, we dont kno what’s safe

  4. When you take a supplement you know just what the strength is (500 mg per capsule for instance)
    But how do you determine the strength if using the whole root? I am trying the Meriva form for my joint pain issues after reading some research studies on it.

  5. Hello,
    In the list above under “Speaking Tour”, please consider including the name of the city so we don’t have to search each item to see where it is taking place.
    Thank you!

  6. I understand that turmeric is very high in oxolates and that’s the only reason I take curcumin instead. I have a problem excreting oxolates and they are toxins that build up in the body over time and can cause severe pain and all kinds of obstructions.

  7. I would love to just add some turmeric to whatever I am eating but I keep reading that turmeric is only effective if it is taken with a fat of some sort, some black pepper and heated before consuming! Otherwise it is not doing what it needs to be doing. I would love to hear what Dr. Gregor has to say about this….

  8. Good evening,
    it is not true that other curcuma long extracts have not been studied. A few interesting studies on curcuma’s polysaccarides on pain and osteoarthritis have been published.

    1. After looking at a study that gave whole fresh turmeric, I think they used about 5 g per day. I put that much in my smoothie along with fresh ground peppercorns. Any more than 5 g and it begins to get overpowering.

  9. Some time ago I suffered a great ripping pain in my upper right abdomen area, I was crippled for half an hour or so. These pains came and went for weeks.
    My daughter Lucy’ realised after reading an M. Greger blog,that I was taking my home made turmeric pills every morning and that perhaps they were the culprit.
    I stopped taking them, had an ultrasound and there were the gall stones!
    Eighteen months into my plant based new life, the gall stones have gone(?)
    I am waiting on my latest MRI results on a bloom found on my Gall bladder.
    I hope it turns out as nothing more than an escape route for the stones.
    I now know that turmeric can have a very negative impact on a congested gall bladder thanks to Michael Greger, via my daughter. The pills I took were made with a reputable organic turmeric powder.

    1. If the onset of your misery coincided with beginning the turmeric (more or less), and ceased when you stopped taking it, that seems to me to lean pretty strongly to causation rather than just correlation – but I hope in the interests of preventing future problems, your medical advisers are looking further than just the reaction to turmeric.
      Good that you are gradually getting past the problem, however it may have been caused.

  10. Awhile back on another video i commented about eating the whole root with the skin. I slice it about 1/4 inch, douce it in freshly ground pepper and pop it in my mouth chew then swallow. A fellow was arguing with me as to why i would do something so distasteful and not just pop a pill. This article validates my belief that whole food has enzymes and cofactors that is not present in processed manufactured singular nutrient pills.

  11. I do both, curcumin (supplements) and turmeric in cooking and golden “milk” (non-dairy). I have 17p deletion myeloma and I believe it has helped to keep me in remission for past 6 years.
    I’m afraid to stop the supplements but I’m glad to know that using the spice is also beneficial. Thanks for the update. I follow your “How Not To Die” book and I’m completely plant based in my diet. Thanks Doc, you rock!

  12. hi dr. g. thank you very much for explaining the problem with this reductionist philosophy. i wish more of your colleges would do the same. kudos, scott becker

  13. I found that the pills gave me acid mouth and repeated on me, but I now add grated turmeric in my salad every day along with a little black pepper and grated ginger.

    1. For turmeric root powder, Dr. Greger’s Daily Dozen lists 1/4tsp as the dose, but for whole turmeric root you would need to take a few grams to receive the same amount of the active compounds. 2-4g/day would be a safe bet.

      I hope this helps,

      Matt, Health Support

    1. This question would be best addressed to your medical professional. Of course if anyone here has personal experience to share that could be useful but should never be taken as definitive!

  14. Hi.

    Is there a daily max dosage for curcumin (the powdered yellow stuff)?

    Can one take to much of it?

    Also – is it true that it needs to be taken with fat (oil) to be effective?

    Thank you!
    Ps english is not my first language
    Pps I have ADHD so have difficulties dealing with to much scientific (or ambiguous) data

  15. Harry: It appears turmeric has very little potential for side effects, although Dr. Greger does mention caution for those who have a history of kidney stones. Please review this video:

    You asked about curcumin daily dosage. Dr. Greger’s Daily Dozen mentions 1/4 tsp as the dose. If you are using the whole turmeric root you would need to take a few grams to receive the same amount of the active compounds. 2-4g/day . Hope this is helpful. .

    1. Hi.

      Thank you for your reply.

      I’m living in Sweden – does tsp mean tea spoon (smaller) or table spoon (bigger) ?

      Are these measurements generic (same in Europe and the USA).

      With kind regards, Harry.

Leave a Reply

Your email address will not be published. Required fields are marked *

Pin It on Pinterest

Share This