92% of Hashimoto’s patients with Vitamin D deficiency

92% of Hashimoto's patients with Vitamin D deficiency

Has your doctor tested you for Vitamin D deficiency?

Written by David Clark, DC

I’m going to explain why Vitamin D deficiency is connected to Hashimoto’s hypothyroidism.

Vitamin D is a critical regulator of your immune system and research has already established that Vitamin D deficiency is highly associated with other autoimmune diseases like Multiple Sclerosis and Type I Diabetes.

And Vitamin D deficiency IS associated with Hashimoto’s hypothyroidism–another autoimmune condition.

What is Hashimoto’s?

Hashimoto’s is an autoimmune attack on the inside of your thyroid gland. Over time, your immune system destroys the inside of your thyroid gland—so much, that you can’t make enough thyroid hormones and you suffer low thyroid symptoms.

What low thyroid symptoms does Hashimoto’s hypothyroidism cause?

Here’s a short list:

  • weight gain
  • constipation
  • hair loss
  • brain fog
  • a need to sleep excessively in order to function
  • high cholesterol
  • infertility
  • joint pain

In 2011 a great scientific study looked specifically at Hashimoto’s patients and Vitamin D.

The researchers took 161 confirmed Hashimoto’s patients (meaning these people had positive TPO antibodies and/or positive TGB antibodies) and measured their Vitamin D levels.

The results of their study are downright scary.

92% of the Hashimoto’s patients had Vitamin D deficiency.

This study defined Vitamin D deficiency as less then 30 ng/dl.

148 out of 161 had Vitamin D deficiency. Crazy, right?

It gets worse.

They even broke down the results into three categories of Hashimoto’s patients:

Overt Hypothyroidism
Subclinical Hypothyroidism

Let me explain what those mean.

Overt Hypothyroidism Hashimoto’s means:

The person has high TPO and/or TGB antibodies.
Their TSH is high.
The person has low thyroid symptoms (I see these every day).

Subclinical Hypothyroidism Hashimoto’s means:

The person has high TPO and/or TGB antibodies.
Their TSH is high.
The person does NOT have low thyroid symptoms (I don’t see many of these).

Euthyroid Hashimoto’s means:

The person has high TPO and/or TGB antibodies.
Their thyroid lab test numbers are “normal.” (I see quite a few of these people in my practice).

Now here’s how they broke it down.

94% of Overt Hypothyroid Hashimoto’s patients had Vitamin D deficiency.

98% of Subclinical Hypothyroid Hashimoto’s patients had Vitamin D deficiency.

86% of Euthyroid Hashimoto’s patients had Vitamin D deficiency.

(The researchers say that it’s not statistically significant in the euthyroid group. But I’m telling you it is clinically, practically significant.)

Look at those numbers again….see how many of those Hashimoto’s patients had Vitamin D deficiency? Huge.

We know for sure that Vitamin D has something to do with Hashimoto’s. But what exactly does Vitamin D do?

Here’s the short answer…

Vitamin D is a critical regulator of your immune system.

Without Vitamin D your immune system can become over-exuberant. Without Vitamin D your immune system can easily become unbalanced. Vitamin D deficieny can lead to an expression of an autoimmune attack on a tissue.

So for example in Hashimoto’s….

if you carry the gene for Hashimoto’s and you become Vitamin D deficient your gene can turn on and you can start expressing it and start attacking your thyroid. Over time you become low thyroid and you develop low thyroid symptoms.

And then…you go see a doctor who probably doesn’t test you to see if you’ve got Hashimoto’s (medical doctors have nothing to offer but replacement hormones anyway). They just put you on Synthroid or Armour…

…but in the long run you end up not feeling much different because the replacement hormones just don’t do much for the underlying autoimmune process.

Sadly, this is exactly what usually happens to a person with Hashimoto’s.

Does this mean that you should buy Vitamin D and start supplementing?

No, it doesn’t.

Because even though Vitamin D is relatively harmless, you don’t know how much you need. Plus, there’s a complex situation in which if you take the wrong dosage of Vitamin D— read carefully— if you take the wrong dosage of Vitamin D you can actually make yourself worse.

Taking the wrong dose of Vitamin D can make you have MORE low thyroid symptoms—even if you really are Vitamin D Deficient.

That scenario nvolves something called 1, 25-dihydroxy vitamin D, and is a little bit beyond what I want to explain here.

The takeaway message….

Even though there’s a 90% chance that you’re Vitamin D deficient if you have Hashimoto’s— this doesn’t mean you should go out and start supplementing Vitamin D.

You need to find someone who understands exactly what I’ve been telling you about, someone that understands there are other things to look at… and that Vitamin D, even though it’s important, is not the magic bullet.

In my practice we see a lot of people that need Vitamin D but some people need more or less than others–and many times it’s the difference between the person feeling good or feeling worse. A small number people can’t take Vitamin D at all—even though they’re defiicient.

Find someone that knows what to do.

About David Clark, DC

Dr. David Clark found Chiropractic during his journey to change his own health and poor habits. In 2005 Dr. Clark became one of less than 1,000 board-certified Chiropractic Neurologists in the world. Chiropractic Neurology brings together current research findings from fields such as psychology, neuropsychiatry, neurology, neurophysiology and nutrition. Dr. Clark has lectured at leading chiropractic colleges, medical schools and private schools on topics such as alternative medicine, nutrition, neurology and learning/behavior problems such ADHD, Autism and Dyslexia. He specializes in treating Hashimoto’s Autoimmune Thyroiditis at his Center for Low Thyroid Solutions in Durham, NC.


Thyroid. 2011 Aug;21(8):891-6. Epub 2011 Jul 13.

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About Dana Trentini

Dana Trentini founded Hypothyroid Mom October 2012 in memory of the unborn baby she lost to hypothyroidism. This is for informational purposes only and should not be considered a substitute for consulting your physician regarding medical advice pertaining to your health. Hypothyroid Mom includes affiliate links including the Amazon Services LLC Associates Program.


  1. I Asked My Endocrinologist The Other To Test Me Nutrients Deficiencies, And She Told Me The In Today’s and Age And Technology There Is No Such Thing As Nutrient Deficiency’s So I Don’t Need To Be Tested For That, Even After I Showed Her The Clean Hair I Collected From My Hair Bruch, From A Brushing After I Had Washed My Hair, It Was A Lot Of Hair , And She Says I Am Not Nutrients
    Deficient Without Testing For It, So Now I Have Found Me Natural Path And My First Appointment Is Monday 💜☮️🤩😇💜🌹

  2. Teresa B Jackson says

    Very Interesting. Right now My Mom is suffering with breathing Problems that seem to be related from some Digestive Problem. She also suffers from her TSH1 and 2 being out of sort. She has some autoimmune defiency going on, and while they are treating her with prednisone. it seems to be botching up in her system and not properly distributed through out the body and is causing depression and severe irritability. I believe that this article is on target, but patients who suffer need more testing to determine exactly what underlying problems exist. With much research, and experience may not help my Mother, but hopefully I will discover the whole scenario and discover what the answer is for those that suffer this. God Bless and keeping it Real

  3. Honestly, guys, just take a vitamin D supplement with K2. Test your levels frequently and stop when you end up around 80.

  4. Katherine Hawthorne says

    I have recently gone through ct scans and ultrasounds on a 3.4×2.5 nodule on my left thyroid, was diagnosed with hypothroidism in 1995 , have been taking synthroid and now levothyroxin, highest dose for over year now. 137. Have had many problems. Have also had in 2 years fractures in both feet. My orthopedic Dr. Called yesterday after blood test for vitamin d deficiency, says I am at 15??? Wants to put me on a prescription strength vitamin D, after reading this article I think I need to call him back, I don’t believe he read all my history and what’s going on right now, which I can’t even get into the referral endocrine Dr until end of Oct for biospy. Frustrated and tired!!!

  5. Bobbie Kvapil says

    Is there a doctor in Chicago area that treats thyroid conditions?

  6. SartorialExcellence says

    How is this helpful? Vitamin D deficiency can be causing you to be terribly ill, but whatever you do, don’t take it. What a stupid, frustrating article!

  7. Kelly Boyd says

    I was lucky enough to have found a Dr that did all the proper tests. I was diagnosed with hashimoto’s today along with vitamin D and vitamin B deficiencies. I am so relieved to have a diagnosis that explains my symptoms. I went to several Drs before I found her, I asked them all if upon testing for hashimoto’s we stumbled on a diagnosis of they would treat my symptoms or the disease. She was the only one that said she would treat the disease. I hope her treatment plan is a success because I’m sick and tired…literally.

  8. John Halgren says

    This blog is becoming pointless. If I could find a dr that knew this I wouldn’t be googling ‘vitamin d deficiency and Hashimoto s’.

  9. Angela Barnes says

    I guess this whole article was an advertisement for the Dr at the end. How disappointing!

  10. Agreed. I was really hopeful when I found this article but the ending leaves me nothing but frustrated. “Here’s your problem. Most doctors won’t diagnose it correctly. Go find a doctor who will diagnose it correctly.”

    Since every doctor I’ve ever been to acts like thyroid issues are no big deal (and I’ve seen MANY doctors) I won’t hold my breath on finding a good one who will help.

    • I agree with you totally! I can’t stand it when they say “find someone professional that can help you”…. and where would that be??

  11. Presenting a takeaway without a solution is torture. Please elaborate more on the 1, 25 vitamin D deficiency link & solution. Aside from find someone who knows. Thanks

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