Separating Fact from Fiction on Cod Liver Oil | Chris Kresser
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Separating Fact from Fiction on Cod Liver Oil

by Chris Kresser

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I’ve received several questions about the safety of cod liver oil (CLO) since the Vitamin D Council warned consumers about the ingestion of CLO due to concerns about potential vitamin A toxicity in their November bulletin.

Sally Fallon, president of the Weston A. Price Foundation, recently wrote a letter to members clarifying the issues raised by the Vitamin D council and exonerating cod liver oil.

If you’re having second thoughts about the health benefits of CLO, please read this and pass it on to anyone you know who currently takes or is considering taking cod liver oil.

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Dear Members,

We are obliged to issue another official statement on cod liver oil after the November bulletin of the Vitamin D Council, which contains “an unprecedented warning about the ingestion of cod liver oil and resultant vitamin A toxicity.”

The warning accompanies a report on a review article co-authored by Dr. John Cannell, head of the Vitamin D Council, and fifteen other researchers, entitled “Cod Liver Oil, Vitamin A Toxicity, Frequent Respiratory Infections, and the Vitamin D Deficiency Epidemic” in the November issue of Annals of Otology, Rhinology and Laryngology.

NO PROOF THAT VITAMIN A IS TOXIC
Most of this paper is a review of studies showing the benefits of vitamin D in protecting against various illnesses, including respiratory infection. THIS PAPER DOES NOT PRESENT ANY INFORMATION WHATSOEVER INDICATING THAT COD LIVER OIL IS TOXIC, and, in fact, admits that vitamin A can significantly reduce the incidence of acute lower respiratory tract infections in Third World children.

A portion of the review article is an attempt to explain why a 2004 study providing 600 to 700 IU of vitamin D and 3,500 IU of vitamin A in the form of cod liver oil and a multivitamin failed to meaningfully reduce upper respiratory tract infections when studies from the 1930s found that cod liver oil could reduce the incidence of these infections by 30 to 50 percent. The authors of the recent commentary suggested that the older studies were more effective because cod liver oil in the 1930s contained much more vitamin D. They suggested that modern cod liver oil is low in vitamin D because the deodorization process removes the vitamin while manufacturers fortify the oil with only a fraction of the original amount. As an example, they cited cod liver oil made by Nordic Naturals, advertised as containing only “naturally occurring vitamins A and D,” which has only 3 to 60 IU of vitamin D per tablespoon but between 150 and 12,000 times as much vitamin A.

This conclusion is essentially the same as the conclusion reached by the Weston A. Price Foundation and the research of Chris Masterjohn; we have continually pointed out that vitamins A and D work together and that without vitamin D, vitamin A can be ineffective or even toxic. We do not recommend Nordic Naturals regular cod liver oil or any brand of cod liver oil that is low in vitamin D. But it is completely inappropriate to conclude from this 2004 study that cod liver oil is toxic because of its vitamin A content. Similar reviews could be put together showing the benefits of vitamin A and cod liver oil in numerous studies, including the studies from the 1930s. Obviously the solution is to use the type of cod liver oil that people took in the 1930s, which did not have most of the vitamin D removed by modern processing techniques.

I recommend Extra Virgin Cod Liver Oil from Rosita as my preferred cod liver oil product. It is real Norwegian cod liver oil that is fresh, raw & handcrafted from wild livers using a very rare ancient extraction technique which uses nature to separate the oil from its liver. No chemicals, solvents and mechanical devices are ever used during the extraction process, and it is free of heavy metals, dioxins, PCBs, and other contaminants (verified by independent testing on Rosita’s website).

VITAMIN A DOES NOT ANTAGONIZE VITAMIN D
The Vitamin D Council report claims that the vitamin A in cod liver oil is excessive and antagonizes vitamin D by inhibiting the binding of its active form to DNA and thus preventing its ability to regulate the expression of vitamin D-responsive genes.

Vitamins A and D are both precursors to active hormones that regulate the expression of genes. The body possesses certain enzymes that convert each of these in a two-step process to their active forms: vitamin A is converted to retinal and then to active retinoic acid while vitamin D is converted to calcidiol and then to active calcitriol. While directly consuming either retinoic acid or calcitriol would be unnatural, consuming vitamins A and D, together, as in cod liver oil, is perfectly natural. The enzymes involved in these conversions are responsible for producing incredibly powerful hormones and are therefore highly regulated.

In order for vitamin D to activate the expression of its target genes, it must bind to the vitamin D receptor (VDR) and then combine with the retinoid X receptor (RXR), which is activated by a particular form of vitamin A called 9-cis retinoic acid. RESEARCHERS FROM SPAIN RECENTLY SHOWED THAT VITAMIN D CAN ONLY EFFECTIVELY ACTIVATE TARGET GENES WHEN ITS PARTNER RECEPTOR IS ACTIVATED BY VITAMIN A.

In the ABSENCE OF VITAMIN A, molecules called “corepressors” bind to the VDR/RXR complex and PREVENT vitamin D from functioning.

The molecular biology of 9-cis¬ retinoic acid, however, is extremely complex, and this has led to some confusion. The RXR and its activator 9-cis retinoic acid partner up not only with the vitamin D receptor, but also with the receptors for steroid hormones, thyroid hormone, and most other nuclear receptors. In fact, if enough 9-cis retinoic acid is present, RXRs will even partner up with themselves. Ordinarily, this versatile form of vitamin A is gradually derived in small amounts from the larger pool of all-trans retinoic acid as needed. When scientists add large amounts of 9-cis retinoic acid to isolated cells, then, it may cause effects that smaller amounts naturally produced in the cell would not cause.

Researchers have shown, for example, that 9-cis retinoic acid interferes with the ability of vitamin D to stimulate the production of osteocalcin, a vitamin K-dependent protein involved in organizing the mineralized matrix of bone. This may have been because the excessive amount of 9-cis retinoic acid caused RXRs to pair up with themselves and thereby made these receptors unavailable to vitamin D. When scientists incubate cells with activated vitamin D and all-trans retinoic acid, ordinarily the source of 9¬-cis retinoic acid in the cell, the two hormones stimulate the production of osteocalcin with remarkable synergy.

More information on the interactions between vitamins A and D can be found in these articles:

Vitamin K2

Does Vitamin A Cause Osteoporosis?

Vitamin D Safety

The Spanish research demonstrating the necessity of 9-cis-retinoic acid for the functioning of the vitamin D receptor can be found here, and here:

PLANT FOODS ARE NOT A GOOD SOURCE OF VITAMIN A
In the December Vitamin D Council newsletter, Dr. Cannell further claims that consuming preformed vitamin A is “unnatural” and that the body highly regulates the conversion of carotenoids found in vegetables to vitamin A as needed. However, the enzymes that convert carotenoids to vitamin A are less critically maintained because they are unneeded when preformed vitamin A is provided in the diet-as it usually is. They are therefore, like the enzymes that convert essential fatty acids in plant oils to their elongated and desaturated forms, subject to variations in genetics, circumstantial health, and dietary and environmental influences.

Many factors can interfere with the conversion of carotenoids into vitamin A including thyroid problems, liver problems, diabetes and genetics. Babies and children convert carotenes very poorly if at all.

The statement that preformed vitamin A is unnatural is ludicrous in the light of what we know about traditional diets. The chief source of calories in the traditional Inuit diet, for example, is seal oil, which Weston Price found to be higher in vitamin A than cod liver oil. Fish heads, extremely rich in vitamin A, are a staple in the Japanese diet. Many cultures consume liver, often in high amounts-yet the authors of the review paper imply that liver is toxic. Tell that to the Frenchman enjoying his foie gras, the Englishman consuming liver and onions, or the South Sea Islander who submits to great danger to obtain shark liver for men and women, in order to ensure healthy children. The truth is that pre-formed vitamin A is more plentiful in traditional foods than vitamin D, yet politically correct nutrition insists that we must obtain vitamin A through the laborious process of converting carotenes.

More information on the conversion of carotenoids to vitamin A can be found in this article and this one: (see the section “Vitamin A Vagary”).

COD LIVER OIL IN PREGNANCY
The Annals paper does not cite any studies showing toxic effects from cod liver oil, but Dr. Cannell cites one study in his December newsletter associating intake of cod liver oil with hypertensive disorders during pregnancy. Users of cod liver oil in this study had about twice the intake of vitamins A and D as non-users and eight times the intake of long-chain omega-3 fatty acids. The study found the most robust association with long-chain omega-3 fatty acids, which were associated with lower risk between 0.1 and 0.9 grams per day and higher risk above 0.9 grams per day. The authors suggested that the association with high blood pressure might be related to oxidative stress caused by a high intake of polyunsaturated fatty acids.

The abstract of the study can be found here:

The new Annals article offers nothing new to incriminate cod liver oil. It provides a well-written argument that vitamin D intakes need to be higher and incriminates only highly processed modern cod liver oils that have inadequate amounts of this critical nutrient. We recommend only high-vitamin cod liver oils that provide abundant vitamins A and D without an excess of polyunsaturated fatty acids.

THE COD LIVER OIL PUBLIC HEALTH INITIATIVE
As we pointed out in our last update on cod liver oil, during the first half of the century, cod liver oil was the focus of a worldwide health initiative. Parents were urged to give cod liver oil to their children by doctors, by government officials, by teachers and principals in schools, and even by their ministers in churches. A large portion of adults in America born before the Second World War received cod liver oil as children and this practice contributed to a high level of health, intelligence and physical development in those lucky enough to receive it. In many European countries, children received a daily ration of cod liver oil, especially during the war years. In the UK, for example, the government issued cod liver oil to all growing children until the early 1950s.

What has led to the demise of this obviously beneficial practice? Cod liver oil is a food; it can’t be patented, it can’t be created in a laboratory; it can’t create millions for the drug companies. So interest in this wonderful superfood has naturally waned. But if you are basing your dietary habits on the principles of healthy nutritional diets, don’t hesitate to include cod liver oil-our recommended brands of cod liver oil–as a healthy and natural food source of critical vitamins so lacking in modern diets.

Sally Fallon, President
The Weston A. Price Foundation

recommended links

  • Dr. Ron’s: a great place to purchase Blue Ice High Vitamin and Fermented Cod Liver oil.  I also like Dr. Ron’s line of additive-free supplements.

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    • Hi, Chris, I would like to know if you will continue to promote the Weston A. Price Foundation and Sally Fallon Morell given that she is recommending NutraPro International cod liver oil whose owner is apparently a registered sex offender?

      Here’s the information I found: http://www.cheeseslave.com/fermented-cod-liver-oil-scandal-new-development/

      I was alarmed to find out that the owner of NutraPro International apparently friended me on Facebook using a fake name. Do you know this man and do you know he was arrested for sexual predatory behavior online? He was stalking a 13-year-old girl which turned out to be an undercover police officer.

      NutraPro is listed in the “Best” category for CLO on the WAPF website. I’ve emailed Sally Fallon Morell to ask her what she knows about the arrest and if she has a statement.

      Perhaps you’d also like to write a post about this to warn your readers? I was alarmed to find out that the owner of the company apparently friended me on Facebook using a fake account. You might want to check your friends list and see if he added you.

      Thank you,
      Ann Marie Michaels

  1. In South Africa they have been selling Cod Liver Oil for decades. The same brand stocked by all chemists.
    I have never seen marketing for Cod Liver Oil here, which makes me curious as to why its still being sold.

    If the product was totally useless, and taking into consideration the zero marketing for the product, why would anyone buy the product? Maybe there is some benefit…

  2. I hope someone can give me an advice.
    Last two winters my dad has had terribly colds . He is tired after this and has problems with eyes and irritated throat as well.He is 79.
    I bought some suplemments for him.
    Vitamin D3( 2.200 iu per cap),zinc(22mg per cap),and vitamin A(50.000 iu per cap).
    The problem comes with vitamin A. There wasn’t any other size but 50.000 iu per cap in the store.
    I told him to take just one cap per week due to the high amount of retinoic acid.
    I told him to come back to eat cheese that used to consume before and had stopped eating because he was fear of high cholesterol ,and some goose liver as well for the K vitamin.
    He takes a multivitamin (cheap one,small amounts) and extra vitamin C by his own every day.
    I told him to take,one cap per day of zinc,two caps per day of vitamin D3 and one cap per week of vitamin A during one or two months.
    After reading your comments I am afraid not being cautious.
    I would appreciate your opinion.
    Sorry about my english,I’m not english speaking.

    • Hi Nagore,
      You could look into high dosage Vitamin C to support your father’s health. Easily upto 8 gr (8000 mg) per day. You can Google this, or read more on doctoryourself.com.
      Good luck!

  3. Can taking 2 FCLO caps & 2 HVButter Oil caps lower blood pressure?

    The first night I took the above I awoke, as usual, at 05:00. MY bp was 98/74 instead of the normal for me of 135/89. I was scared to take it again since I didn’t know if this caused my bp to lower so much, though it never happened before and I couldn’t think of any other reason why it happened then.

    By the way, my daily neck & back pain went from a scale of 8-9 to 1 overnight!!! The next night, w/o the oil caps, I awoke still with pain of only 5.

  4. If man makes it don’t eat it. Why buy the oil when you can eat the fish. It will cost less. My experience with Cod Liver Oil is that it is all marketing and hype. Reading the comments here makes me realize thay everyone is suddenly an expert in nutrition and fitness. I’ve been a fitness nut since the early 80’s when I was in middle school and I have seen fads come and go. Back then no one was taking Cod Liver Oil or buying obscene amounts of muscle milk. We ate real food with no problem. Eat real food. It’s far better than supplements.

  5. Now, why is the author so mad???
    Toxicity just means an over abundance in the body to where it begins to cause problems. So many are blindly taking cod liver oil to raise their d levels. Well, if you are low on d, taking clo for that purpose will land you in vitamin a toxic land, long before your low d is addressed. You see, our diet is such that we receive quite a bit of vitamin a just in our everyday foods. Taking upward of 13000 iu of a via clo, just to have a few iu of d…well…that’s the problem.

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