#AskTamara: Is there an unsafe level of lead in bone broth?


Question: Is there an unsafe level of lead in bone broth?

Original blog post title: “YES, there are high levels of lead in bone broth (and NO, it is not safe to ingest lead)!

Answer: Maybe. [& most likely “yes”.]

There are several different studies to look at and different considerations to take into account when answering this question.

Unfortunately, more often than not “health-gurus” and “health bloggers” including some with MEDICAL credentials will (in their writing) attempt to diminish or discount the impact of the possible (and likely) concentrated levels of lead found in bone broth.

Is there an unsafe level of lead in bone broth?

However there are some facts that just cannot be ignored when exploring this concern:

  1. Lead bio-mimics calcium when absorbed by natural structures.
  2. Bones are high in calcium.
  3. That is why bones are a storehouse for lead (in all animals).
  4. If an animal is exposed to lead in their environment then their bones will absorb and accumulate this lead in the place of calcium.
  5. This lead can come from many environmental sources (even in 2018):
    • from feed (many documented sources for contamination here)
    • from tractors and other farm vehicles’ exhaust (yes, many of these – legally – still use leaded fuel!)
    • from soil (which can be contaminated with lead from historic leaded pesticide use, historic lead paint use on equipment and structures and related renovation/ sanding/ power washing, and historic and current leaded gasoline use]
    • from both modern and legacy paint and industrial finishes on farm equipment and buildings (yep, lead still legal in lots of “non-residential” paint as well!)
  6. When you make broth from these bones or cartilage (vs. from the meat of the animal)  – be it a chicken or a cow or a pig, you are using the most leaded part of the animal to make the broth.
  7. The broth, which is often simmered for hours or even days, will (by nature and design) pull all of the “nutrients” and “minerals” out of the bones and into the broth… and this includes lead.

There is no valid justification (not a single one) to intentionally concentrate lead in a single food source to add it to your diet. Just don’t do it.

Here are two ways to help make your sure your broth will likely have lower levels of lead:

  1. Make your broth out of the meat of the animal.
  2. Source your broth ingredients from known farms, farms where you have EVIDENCE that the farm does not use leaded gasoline (which, as stated above, is still legal to use in farm equipment) and does NOT have old lead painted farm buildings (it’s also perfectly legal for even organic farms to have old lead-painted buildings, vehicles, and industrial equipment!) and does NOT have soil that is lead contaminated from previous / legacy leaded pesticide use, and is NOT near a freeway or small airport that might have generated a lot of lead residue from leaded gasoline use [in the past for freeways and in the present for small airports (you guessed it – small planes still -legally- use leaded fuel!] that may have contaminated the soil.

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The quote below is from the following article. (link here). In spite of this quote, this “health blogger” is still advocating for the use of bone broth as a healing substance!

Screen Shot 2017-03-28 at 5.00.49 PMHere are some other links to bloggers trying to discredit science and convince you that it is safe for you and your family to drink broth that potentially has high levels of lead in it.

These blogs are citing each other as “evidence” for disregarding the settled science in this matter!

Like with Earthpaste, these people are too passionate about the alleged health benefits of something, to even begin to realistically consider or assess the actual, scientifically measured, known health risks of that same thing. Their passion is blinding them to the truth.

Here’s someone who knows their stuff and has a blog! NutritionFacts.org
Watch this amazing video ^^^^

Here is the link to the actual 2013 bone broth study abstract:

Is there an unsafe level of lead in bone broth?

Update 9/4/2017

Additional info for folks who question the presence of a concentration of lead in bones.  There are many scientific journals and articles that discuss the fact that lead is concentrated in bones because lead bio-mimics calcium and bones are calcium-dense.  [The articles have nothing to do with broth, but with bone development in biological structures – including animals … including chickens, cows and humans.] Here is one example that I found without to much googling:

From the book: “Fundamental Concepts of Environmental Chemistry” [2005]

Is there an unsafe level of lead in bone broth?

As always, please let me know if you have any questions!

Thank you for reading and for sharing.

Tamara Rubin

33 Responses to #AskTamara: Is there an unsafe level of lead in bone broth?

  1. Nicole March 28, 2017 at 8:04 pm #

    Thanks for bringing this issue to our attention. However, though it’s not implicitly illegal for farm equipment to use leaded fuel (or small airplanes), it’s virtually impossible to find leaded fuel to put in your vehicle. I do agree with you that it is very important to be aware of the source of your food, for many reasons including this one. To argue that bone broth is inherently dangerous, however, is a flawed argument. The bone broth will not contain elevated levels of lead if the animals were not exposed to lead. No one is advocating that people “drink broth with high levels of concentrated lead in it”. Broth is amazingly healthy for us if it isn’t contaminated. It’s very depressing that we have to be so careful these days. We are swimming in toxins. That’s why I choose to grow my own food. When possible, everyone should be buying their food directly from farmers so they know what goes into their food, and so that they support the small farmers that are growing nutritious, wholesome food. There are many ways food can become contaminated in the industrial system. Thanks, again.

    • Tamara March 28, 2017 at 8:34 pm #

      It’s not difficult at at all to procure leaded gasoline, unfortunately. It’s very commonly used in small airplane avgas – and there is a big fight now to try to get it outlawed because these small airports are often near farms and schools and communities with young children!

      • Emily May 4, 2017 at 9:13 am #

        …And there’s a perfectly good reason for it still being used by small (piston-engine) airplanes – preventing “engine knocking” combustion patterns and leaking around seals and such that can make flying a plane destructive. Some small planes can use modern, unleaded gasoline, but many high-performance engines used in the small commercial-type aircraft that are a lifeline in many parts of the nation can’t (this is not true of jets, because jet engines operate entirely differently. They can use kerosene).
        Although I agree that it is in nobody’s interest to be exposed to lead (including pilots), there is currently no solution, though it is being researched and worked on, I understand. It will be great when they do find one.
        When I worked in government public relations, I read complaints nearly daily from people who were outraged about this or that without taking the time to understand the issue from all angles (i.e., maybe the regulation you are insisting on changing is actually governed by statutory authority, which takes legislative action, or you’re misunderstanding the science). This is not a simple issue, and it needs more than simplistic answers like “outlawing” avgas.

        -A Pilot’s Wife

    • jenna March 29, 2017 at 10:25 am #

      I appreciate reading your opinion, Nicole. thank you!

  2. hari March 29, 2017 at 1:09 am #

    So is it possible to test for lead in a liquid item? it would really settle the question…

    • Tamara April 1, 2017 at 1:15 pm #

      Yes it is. I don’t have a lab I use currently, however if you do send it to a lab, you would want to make sure to ask them to test down to food toxicity levels, specifically in parts per billion (not giving you results in parts per million.). For context, water is considered toxic and unsafe (depending on whose standards you use) at either 5 parts per billion or 15 parts per billion.

  3. Katie Fisher March 29, 2017 at 1:22 am #

    So how do you get glycine, proline and the other amino acids not so plentiful in muscle / organ meats? Lead isn’t good, but neither is a methionine-rich, glycine-poor diet which increases your likelihood of choline deficiency and fatty liver disease.

    Has anyone studied broth made from other animals? Do we know how it compares with chicken?

    Has anyone tested supplements based on bone for lead content eg bonemeal, calcium hydroxyapatite? Is milk affected too? I’m pretty sure my EBF son’s elevated lead on a hair test was due to lead via my milk (I was calcium deficient but neither I nor my other son had elevated lead on the hair test).

  4. Jamie March 29, 2017 at 9:05 am #


    Can you please tell me your response to this from Redmond Clay, as it is how I understand clay works. Through bonding and eliminating, not “leaching” or leaving behind. .

  5. Allie March 29, 2017 at 9:46 am #

    This just simply isn’t true. There are a bunch of reasons listed why bone broth might contain lead and one flawed study that doesn’t take into account the types of animal bones used, the quality of the water or the utensils used during cooking. Bone Broth does not inherently contain lead. It all goes back to the quality of the water, the way the animals were raised (CAFO vs. limited human interference) and the cooking utensils used in the process.

    I have sent my bone broth in to be analyzed by a 3rd party laboratory and there are no detectable levels of lead in either of the 2 samples I sent in. It’s not my opinion, I have factual evidence that shows there is no lead.

    • Lissa November 5, 2017 at 2:54 am #

      What broth do you use?

  6. Rona March 29, 2017 at 4:51 pm #

    What source of water was used to make the bone broth? Is it possible that the water had high levels of lead and it became concentrated as it cooked down?

  7. K April 1, 2017 at 12:10 am #

    Do you really think theae blogfers you mentioned are actually trying to convince people it is safe to ingest lead??!!! Wow. You also place the words nutrients and minerals in quotation s as if bone broth doesn’t have these. Again, wow. This is the first time I’ve heard of this, so I’m not disputing what you’ve said. I would be hard-pressed to read any more of your articles, though, because of the condescending, deceptive way this one is written.

  8. Sara Dana April 4, 2017 at 3:41 pm #

    So, is it safe to just make chicken stock and drink that? That’s what I do. My son has neurological issues. Just want to make sure im doing the right thing. So much conflicting info!!!!

    • Tamara April 4, 2017 at 7:14 pm #

      Chicken stock is less likely to have high levels of lead (as compared to stock made from bones.)

  9. Laura W April 29, 2017 at 9:36 pm #

    It does seem it depends on the exact animal/farm you’re making bone broth from. I also had a friend whose child had lead poisoning who had her chicken broth tested since they were on a WAPF type diet and consuming chicken bone broth daily. Her broth was negative for lead. Her chicken was from a So Cal beyond organic family farm.

    But if you haven’t tested your broth or bones I don’t see how you can know your broth is lead free.

  10. Sheryl May 1, 2017 at 4:37 pm #

    I am confused. It seems to say that skin and cartilage had high levels of lead too. And they didn’t test making broth with just the meat… So maybe that would have been high too?

  11. Missy May 2, 2017 at 6:52 am #

    Can you not test lead in water? So how is it not able to be tested in liquid? Isn’t water much higher in lead the the bone broth you are mentioning? What about the nutrient synergy of calcium and selenium in binding lead? What about other animal by products not farmed chicken, such as heritage chicken? What about writing a blog on a series of studies instead of one and claiming truth? Funny you mention people as pseudoscience but this appears to be exactly what this blog is. I appreciate this blogger who actually takes how nutrients and metals work together into consideration, and also doesn’t use scare tactics. https://chriskresser.com/bone-broth-and-lead-toxicity-should-you-be-concerned/

    • Tamara May 3, 2017 at 3:09 pm #

      There is no instance in which lead “works together” with nutrients.

      There is no amount of lead that is safe in drinking water.

      The federal hazard level for lead in water (the EPA standard) is not protective of children’s health. Scientists agree.

      Your drinking water SHOULD be 0 (ZERO) ppb (parts per billion) lead, but is considered toxic for ingestion (by scientists and those with children’s health as a primary concern… not federal agencies) at 5 (FIVE) parts per billion (ppb.)

  12. Zoltan May 3, 2017 at 8:05 am #

    Let’s just go over the results of that 2013 bone broth study.

    Tap water had a lead concentration of 0.89μg/l.

    Chicken bone broth had a lead concentration of 7.01μg/l.

    The US Environmental Protection Agency (EPA) has established a safety threshold of 15.00μg/l.

    End of story.

    • Tamara May 3, 2017 at 3:04 pm #

      The EPA threshold is not based on current science. It is not protective of children’s health. It is based on what the Feds felt was achievable as a standard by industry. The new recommended safety level for lead in water is 5 ppb (as a level that is protective of children’s health.) End of Story.

  13. Kristi July 2, 2017 at 7:49 am #

    Bone broth is also ULTRA high in glutamate…and it is contraindicated for those with neurological & seizure disorders. For those with anxiety disorders, glutamate will enhance them 🙁

  14. Ryan August 18, 2017 at 3:02 pm #

    To quote your article:

    “When you make broth from these bones (vs. from the meat of the animal) – be it a chicken or a cow or a pig, you are using the most leaded part of the animal to make the broth.”

    “There is no valid justification (not a single one) to intentionally concentrate lead in a single food source to add it to your diet. Just don’t do it. Make your broth out of the meat of the animal.”

    If you read the study (instead of just the abstract) it says the following lead concentrations were found:

    – 9.5 ugL for broth made with skin and cartilage

    – 7.01 ugL for broth made with bones

    – 2.3 ugL for broth made with meat

    – 0.89 ugL for the lead found in tap water cooked alone

    If readers listen to you and consume broth from the meat, according to this study, they will be consuming far more than the EPA accepted level of lead.

    Yet, you state in the comments above:

    “There is no amount of lead that is safe in drinking water.

    The federal hazard level for lead in water (the EPA standard) is not protective of children’s health. Scientists agree.

    Your drinking water SHOULD be 0 (ZERO) ppb (parts per billion) lead, but is considered toxic for ingestion (by scientists and those with children’s health as a primary concern… not federal agencies) at 5 (FIVE) parts per billion (ppb.)”

    I agree with you. However, it appears your intention was to discredit bone broth as unsafe instead of actually read the study. If you believe this study, you should revise your recommendation about the meat (or perhaps look a little closer and wonder if this study is flawed).

    Now, you asserted that bones are “the most leaded part of the animal,” yet in this study (even in the abstract), the skin and cartilage were the “most leaded.” Somehow, this doesn’t agree with what is known about how animals accumulate metals, nor your statement about “the most leaded part of the animal.” Something isn’t right here, which is what is discussed at length in the Weston A Price and Healthy Home Economist articles by Dr. Kaayla Daniel.

    * Side note: These are essentially the same article posted in two different places. I find your claim that they cite each other as evidence to be disingenuous. *

    Dr. Daniel goes into the reasons why this study appears to be flawed including the fact that the bones should have accumulated the most lead. She concludes that the chickens used in the sample appear to have been contaminated and I find her reasoning more convincing than your blog post.

    Finally, to quote you again: “These guys are all citing each other as “evidence” for disregarding the settled science in this matter!”

    One study, literally ONE study (shown to be flawed, in my opinion), does not equal settled science. Science is never settled as long as you can provide compelling evidence to the contrary. You show your bias (which we are all prone to) with that naive statement.

    • Tamara August 18, 2017 at 6:16 pm #

      We keep a vegan home. We would personally never consume any bone-broth.

      • Sheri Smith September 3, 2017 at 12:18 pm #

        I’m just curious, please don’t get mad for me asking. How many years have you been Vegan and what classification, i.e.: of Vegan would you consider your family? and because everyone has different ‘Reasons’ is your way of eating because of health issues, clean eating, or Ethical reasons for the animals ?Also, did you in the past (before your Vegan way of eating, did you eat the S.A.D. (Standard American Diet) ?

        Thank you, Sheri (Former S.A.D. way of eating) 🙂
        (Molalla, OR)

        • Tamara September 3, 2017 at 12:46 pm #

          I am not vegan.
          My husband has been primarily vegan for more than 20 years, vegetarian for nearly 40 years.
          We keep a vegetarian home (no cooking meat in the house.)
          Some of our children are vegan, some are vegetarian.
          We never cook things like chicken in the house, and everyone except my youngest (who is 9) will not eat anything with legs.
          I was pretty much raised by wolves (my mother was never around much to feed us) and ate “whatever’ until I was around 15 years old – since then I stopped eating anything with dyes, corn syrup, hydrogenated oil or artificial anything… this kicked into high gear with the birth of my eldest son in 1996 (he is pescatarian now) – we also eat nearly 100% organic.

  15. Gina M.D. September 4, 2017 at 4:45 pm #

    Can I just say that first off, you can find the same amount of lead in root and leafy vegetables. You do not absorb all the lead your body takes in and in fact, if you are sufficient in calcium levels you may only take in a mere fraction to nothing. Lead contamination is widespread and if you are eating large amounts of rice and other vegetables you could have higher levels than normal. Lead-arsenate was a commonly used pesticide in orchards and cotton fields. A lot of rice crop is grown on old cotton fields and thus why rice can have high levels.

  16. Tamara Rubin September 4, 2017 at 8:18 pm #

    Another study showing lead concentrates in bones: https://www.ncbi.nlm.nih.gov/pubmed/8492331

  17. westcoaster November 6, 2017 at 10:14 am #

    Just in case this interests those in this thread, there was a follow-up study on several types of bone broth published this year that contains more and new information: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5533136/

    • Nora May 19, 2018 at 12:37 pm #

      Interesting to note that the meat used for the study in this case was not farmed in the US.

  18. Les January 1, 2019 at 8:11 pm #

    Hi, I’m wondering if you’ve seen this article and what your response to it is: https://www.westonaprice.org/health-topics/bone-broth-and-lead-contamination-a-very-flawed-study-in-medical-hypotheses/

  19. Ms Boss March 9, 2019 at 12:43 am #

    Lol right lol like duh there’s lead copper mercury aluminium cadmium chromium etc… why would you think broth is ok to eat or animal bone. That is tge store house for such toxins not including the dangers of too much calcium and magnesium in your diet and if you mainly only eat greens or have anemia you’re more suceptable to the toxins of lead, copper, etc…

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