Why Synthroid® Has Bone Loss Side Effect

This common treatment for hypothyroidism has a surprising side effect. Learn more.


0:00 Introduction: Synthroid® for hypothyroidism
0:20 Side effects of Synthroid
1:02 Understanding common treatments for hypothyroidism
6:33 Learn more about what causes thyroid problems!

Let's talk about hypothyroidism and how it's typically treated.

Treating hypothyroidism with medications like Synthroid can create a dependency on the drug.

A potential side effect of taking Synthroid long-term, especially if a person is post-menopausal, is an increased risk of bone loss.

The thyroid produces more than one hormone, but people are typically treated with only one hormone. So, what about the other hormones?

You need these hormones—they are important for a healthy body. A lack of these essential hormones can lead to various symptoms, like bone loss.

You may want to talk to your doctor about Armour® Thyroid. Armour Thyroid comes from a natural source and contains more than one thyroid hormone.

Dr. Eric Berg DC Bio:
Dr. Berg, age 58, is a chiropractor who specializes in Healthy Ketosis & Intermittent Fasting. He is the author of the best-selling book The Healthy Keto Plan, and is the Director of Dr. Berg Nutritionals®. He no longer practices, but focuses on health education through social media.

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Dr. Eric Berg received his Doctor of Chiropractic degree from Palmer College of Chiropractic in 1988. His use of “doctor” or “Dr.” in relation to himself solely refers to that degree. Dr. Berg is a licensed chiropractor in Virginia, California, and Louisiana, but he no longer practices chiropractic in any state and does not see patients so he can focus on educating people as a full-time activity, yet he maintains an active license. This video is for general informational purposes only. It should not be used to self-diagnose and it is not a substitute for a medical exam, cure, treatment, diagnosis, prescription, or recommendation. It does not create a doctor-patient relationship between Dr. Berg and you. You should not make any change in your health regimen or diet before first consulting a physician and obtaining a medical exam, diagnosis, and recommendation. Always seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition.

#keto #ketodiet #weightloss #ketolifestyle

Thanks for watching! I hope this helps you better understand common treatments for hypothyroidism. I’ll see you in the next video.


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  1. R Sollecito on June 18, 2023 at 10:09 am

    I took rx for years. Had all types of menopause issues like hot flashes for at least 10 years. Also, had bone loss problems.
    I got tired of it one day and decided to stop taking it.
    I feel better without it and taking higher amounts of Selenium.

    • irmila on June 19, 2023 at 3:52 pm

      What is rx? Is it synthroid??
      For how long did you take synthroid before you go to selen?

    • R Sollecito on June 19, 2023 at 4:12 pm

      @irmila2811  I have taken Armor on and off for most of my life until finally ended up on Naturethroid. Not sure spelling, but all rx: subscriptions.
      Then I went to Selenium, B1, B12 and lots of other supplements. Dr. Berg’s videos have helped me figure out deficiencies I have been dealing with.

    • irmila on June 19, 2023 at 4:31 pm

      @R Sollecito Thank you so much for your reply! 🙏🏻❤️

  2. Nathalia J on June 18, 2023 at 10:13 am

    Thank you for this info and video Dr Berg! ❤ I’ve been on levothyroxine since about 2007 , after thyroid ablation, I was in 10th or 11th grade😢. Graves disease.

    • Matthew Alistair on June 18, 2023 at 11:50 am


    • Jamie&Debra on June 18, 2023 at 12:32 pm

      I have Graves Disease too, I’m on methimazole

    • Wide Awake and Aware-22 on June 19, 2023 at 7:27 pm

      @Jamie&Debrasame here with hyperthyroidism, graves and goiter. On methimazole 5mg. I need to get rid of this goiter . God bless. 🙏🏼

    • L Diamondz on June 21, 2023 at 8:09 am

      ​@Wide Awake and Aware-22 Same here, Graves with goiter. I couldn’t take methimazole, as the dose I’d need would have killed me. I ended up getting 4 doses of RAI treatment to kill the thyroid. Now, I’m underactive, and take synthroid. After the RAI, no more goiter, and my popped out eyes went back to normal. I felt great on the synthroid, for about 10 years. Now I feel terrible. I can tell you, Graves is a LOT worse than having a hypothyroid condition. It was the right thing for me, as it was an emergency type situation. Sometimes, you’re damned if you do and damned if you don’t. Good luck to you. ❤

  3. Michelle Watts on June 18, 2023 at 10:18 am

    “Thank you for sharing this informative video about thyroid health! As a friend of someone who has been struggling with thyroid issues, I appreciate the valuable insights and practical tips you’ve provided. It’s empowering to learn more about managing thyroid health and the importance of a balanced lifestyle. Keep up the great work, and I look forward to more content like this!”

    • Dr. Eric Berg DC on June 18, 2023 at 12:47 pm

      Thank you. Glad you love the topic. Wishing you good health.

  4. fidel catsro on June 18, 2023 at 10:18 am

    Sharing Dr Berg priceless notes:

    Treating hypothyroidism with medications like Synthroid can create a dependency on the drug.

    A potential side effect of taking Synthroid long-term, especially if a person is post-menopausal, is an increased risk of bone loss.

    The thyroid produces more than one hormone, but people are typically treated with only one hormone. So, what about the other hormones?

    You need these hormones—they are important for a healthy body. A lack of these essential hormones can lead to various symptoms, like bone loss.

    You may want to talk to your doctor about Armour® Thyroid. Armour Thyroid comes from a natural source and contains more than one thyroid hormone.

    Thank you Dr Berg!

    • Lena-Maria G Louis-Charles on June 18, 2023 at 10:37 am

      THANK You!💕

    • short feral on June 18, 2023 at 10:51 am

      Good morning, Fidel, thank you!

    • jass412 on June 18, 2023 at 1:32 pm

      thank you Fidel , always look for your post

    • Bhupinderjit Parmar on June 18, 2023 at 8:25 pm

      Thanks Fidel.

  5. Candy Kane on June 18, 2023 at 10:53 am

    I was on Armour for a while and every time my Dr ran blood labs, they came back worse. So she increased my dose. I took myself off of it because I felt it wasn’t helping if my labs were worse not better. After a while she tried Naturethroid (not sure if spelled right) and that became difficult to get. I took my self off of that. She put me on selenium, iodine, Dulse, and magnesium. I also became a carnivore and my labs are good.

    • Bass Player on June 18, 2023 at 1:42 pm

      Sounds like you have a pretty good DR…

    • Miffed Microbiologist on June 18, 2023 at 3:27 pm

      My husband went on Ancestral supplements Thyroid and his thyroid panel went normal after years of tinkering with synthetic thyroid. He has Hashimotos. We also removed all inflammatory foods especially gluten

    • Sheridan's Place on June 18, 2023 at 3:56 pm

      @Miffed Microbiologist Do you have a link to that?

    • Lilly on June 18, 2023 at 4:45 pm

      I weaned myself off levothyyroxine using kelp and selenium.

  6. Survival Lilly on June 18, 2023 at 11:23 am

    I have taken this medication for 5 years. Never did well on all of them. Tried 5 different brands of synthroid and 1 naturethroid. I felt really bad when I took them. After years of suffering and antibodies being over 600 I changed my diet to gluten and dairy free. Then my TPO antibodies went down to about 150. So now I dont need thyroid medication anymore. I havent taken it since 3 years. My TSH is at 4.5 right now which is not perfect but OK.

    Also now I noticed that with paleo my antibodies have decreased again being at 80 right now. I found out that processed foods like industrial produced bread is really bad for the thyroid. Now I bake my own organic bread from buckwheat.

    Also if you are not doing well on thyroid medication you probably have a weak adrenal gland, and you should check the cortisol levels in blood and urine.

    • d on June 18, 2023 at 11:42 am

      I have hypothyroid and I’m taking levothyroxine. What is your suggestion for me?

    • Survival Lilly on June 18, 2023 at 11:54 am

      ​@d avoid gluten, dairy at all cost. Best result you will get with paleo tough. For carbs only eat potatoes, rice and buck wheat. Antibodies have a half life of 3 to 9 months. So you need to be consequent in your diet and no cheating.
      Antibodies will be terminated quicker if you do fasting and/or intermittend fasting.

      For quickest results do paleo diet and intermittent fasting with eating from 12 to 20 o clock. In 9 months your antibodies will go down and you can survive without thyroid meds. If you decide to quit on the thyroid meds do it slowly. Every week take a little bit less so your thyroid can adjust. But first you need to do the paleo diet and intermittend fasting.

      Get a book on paleo and read what you can eat.

      Also doing 1 week of keto every 6 weeks or so will help and get rid of antibodies faster.

    • Jesus Guerra on June 18, 2023 at 11:55 am

      The whole glyphosate (herbicide in food) issue seems very convincing when you think about how recent the whole gluten and dairy free trend is

    • Jolene Sailer on June 18, 2023 at 12:15 pm

      @d I was on the same drug for about 3 years and was experiencing hair loss. I stopped taking them about 3 months ago. I go in for a wellness check-up in July. It will be interesting to see where my levels are.

    • Survival Lilly on June 18, 2023 at 12:21 pm

      ​@Jolene Sailer for hairloss you need to take zinc. Hashimoto patients need more zinc than other people

  7. Joe Jackson on June 18, 2023 at 11:23 am

    Always the best. Very few look at the whole picture of human health. None better than you Dr Berg. May God protect and prosper you as The World enters the Dark Days ahead. Suggest everyone read The Books of Ezekiel, Daniel and Revalation, as well as watch and do the things Dr Berg recommends for health and nutrition.

    • Dr. Eric Berg DC on June 18, 2023 at 2:35 pm

      Thank you for your message. Greatly appreciate it. Stay safe and healthy!

  8. Pamela Hauer on June 18, 2023 at 11:57 am

    Thank you for your video. I just had a thyroidectomy in October 2022 due to nodules that were cancerous. Had the radioactive iodine pill in February 2023 for 6 months targeted treatment for rogue cells. Am on Levothyroxine every day. It took a bit for the level to be right but now I feel great. No complaints. From your video, now I understand why the endocrinologist was focused on my calcium and magnesium levels. Unfortunately, a recent PET scan showed activity in a left throat L3 lymph node at the end of May. Started Ketovore and Intermittent Fasting to starve the cancer. Bonus is I am losing weight and some pain and other symptoms I was living with have gone away. I am thankful the original thyroid nodule was discovered by accident. And it sounds funny, but I am also thankful that the recurrence was found in May. It was the kick in the butt I needed to finally take my health seriously and start eating better. Like an alcoholic hits rock bottom to be willing to take steps towards life again! It has taken me 60 years, but I realize I am a sugar and carb addict. There is no “just one bite”, no moderation for ne. If I take one bite, it winds up being several servings. There is No Off Switch. The Keto/Carnivore way of eating has reduced the cravings. But I know it is only 1 bite away… like poison to me. Thank you for your informative videos, Dr. Berg. God bless you. ❤ To others reading this who may be in the same position, know that if I can do it, You Can Do It, too! 👍😁

    • Bass Player on June 18, 2023 at 1:47 pm

      Come back and tell us how the diet has affected your cancer, I’m of the opinion that cancer cells thrive on glucose and can not exist on ketones…

    • L Diamondz on June 21, 2023 at 7:50 am

      Yes, some of us need that kick in the butt to get ourselves on the right track. Mine was fracturing 2 vertebrae, and finding out I had a whole slew of other medical conditions I didn’t have just 2 years ago. One of them being Osteopenia, from the Synthroid. I’m starting to take my health more seriously, now, too. Let us know if your diet helps. I wish you well, good luck, and a full recovery. TC. ❤

    • Pamela Hauer on June 21, 2023 at 11:33 am

      @Bass Player Will do 🙂

    • Pamela Hauer on June 21, 2023 at 11:34 am

      @L Diamondz Thank you! ❤ I hope your health issues all heal 100%, also. 👍😁

  9. jfreelan1964 on June 18, 2023 at 12:23 pm

    Dr. Berg, I had been on Armour thyroid for over a two decades. Now I am back on synthetic thyroid only (T-4). The long term problem the Armour is the it has to much T-3 in the T-4/T-3 ratio. With my limited personal knowledge/use I would say mix synthetic/natural. I don’t know what long term to much T-3 in the body long term effects are either. Personally just glad to be back on Synthetic T-4. Wish I new 30 years ago what I know now.

  10. Nancy_Schmancy on June 18, 2023 at 1:00 pm

    I have Hashimoto’s thyroiditis. It runs in my family going back several generations. Mainstream doctors in public clinics don’t seem to know anything about it. They think that a complete thyroid panel is testing your T4 levels as well as your tsh. They only prescribe synthroid and act like Armour Thyroid is snake oil. I developed a goiter. The doctors didn’t even know what they were looking at on the sonogram. I came to realize that when a doctor stands behind you and feels your neck, they don’t know what they are even feeling. I eventually had my thyroid removed. I don’t metabolize synthetic thyroid hormones very well and so was miserable and pretty non-functional for many years. I can’t even describe the misery. I didn’t get good thyroid care until I found a private doctor who is a Functional Medicine doctor. I have to pay out of pocket to see her, but it’s worth it. She restored quality of life to me. I now take Armour thyroid along with a small dose of synthroid. Mainstream doctors have said, “Oh, my God! She’s going to give you heart damage! Is she even a real doctor!??” Mainstream public clinic doctors are owned by Big Pharma.

  11. Charlene Di Monte on June 18, 2023 at 4:32 pm

    Was on Synthroid for about 2 1/2 years never felt like myself, went to a natural path (as my Dr refused to try a more natural approach) and placed on desiccated thyroid, game changer! Feel like I’m 30 again and my labs are perfect, T3 T4 excellent levels. It’s a horrible drug causes osteoporosis and makes you crazy! 😮

    • Allison Welch on June 18, 2023 at 5:17 pm

      Can you please share what you are now taking, greatly appreciated!

    • Charlene Di Monte on June 18, 2023 at 5:26 pm

      It’s called desiccated thyroid, very similar to armour thyroid, It’s what my naturopath said would work for me based on my blood work. It is made by a compounding pharmacy. I’m in Canada and Dr’s push big pharm, this medication is 1/3 the price. The Synthroid made me feel so weird, not myself. I’m 58 and have been taking it for about 4 years now, feel so much better, but everyone’s different. 🙋🏼‍♀️🇨🇦 Hope that helps. 🥰

    • Allison Welch on June 18, 2023 at 7:30 pm

      @Charlene Di Monte Excellent, Thank you so much for sharing! So very happy to hear that you are doing so much better! 😊✌❤

    • TL on June 18, 2023 at 10:31 pm

      how many mg of the desiccated do you take and how much does it cost per month ?

    • Charlene Di Monte on June 18, 2023 at 11:10 pm

      @TL right now I am at 60mg, it’s based on your blood work, TSH, T4 and T3 levels. We have a health plan so I pay $8 for 90 pills. 🇨🇦

  12. Ruby Leeder on June 18, 2023 at 4:38 pm

    What a great informative video! I have been on synthroid for approx 15 years now and am suffering with osteo arthritis and extreme back pain in the same place as that guy was addressing in your video. I always wondered about natural sources…in Canada it seems very difficult to have doctors change what they are familiar with and the patient suffers. Chronic pain can be debilitating but I have saved your video and will have a talk with my doc next time I see him. Thanks again for your insight!!! ❤️❤️❤️

    • Amal bint Saeed on June 19, 2023 at 11:36 am

      Do you mind letting me know what your doc said/will say? I feel regular docs will dismiss this.

    • L Diamondz on June 21, 2023 at 7:39 am

      In the US the doctors are the same. They don’t want to do anything regarding the thyroid, but prescribe synthroid. They also tell you synthroid is safe. They don’t tell you that you can get bone diseases after taking it for awhile. I now have osteopenia and recently fractured my L1 and T12 vertebrae. If I hadn’t fell, I never would have known about the osteopenia. Life sux rn. The pain is tremendous. I wish you luck. ❤

  13. 3 Card Monty on June 18, 2023 at 6:44 pm

    I tried Armour once. And that was enough. It made me feel like my metabolism & energy were super hyper right after taking it, then 3-4 hours later I was so worn out I couldn’t do any work whatsoever. I’m back on 125mcg of Levothyroxine (Synthroid) and it works great for me.

  14. Yvonne on June 18, 2023 at 7:14 pm

    This is so extremely helpful. I’m so glad you spoke about people who had their thyroid removed, like me. Very few places discuss what happens when the thyroid is removed. I didn’t know about the increased of osteoporosis, my grandmother had severe osteoporosis, she bent over to tie her shoes and her back broke. She recovered but had several breaks in the last 20 years of her life, she lived till 98.

    • L Diamondz on June 21, 2023 at 7:56 am

      Dr. Weston Childs has a channel here dealing with thyroid issues exclusively. You really should watch his videos. He is in total agreement with Dr.Berg on this. Between the 2 of them, we can get our bodies, diets, and thyroid working better. I don’t have a thyroid, either. But I do have osteopenia from taking Synthroid. Good luck to you. ❤

  15. Thuy Wu on June 18, 2023 at 10:48 pm

    Dr Berg channel is the library for medical education. Thank you so much and so much Dr Berg and his team❤

  16. Mona S. on June 19, 2023 at 12:06 am

    I was prescribed Synthroid for Hashimoto’s but it made me feel worse and gain more weight. My doctor rolled her eyes at me when I reported the issues, and when I finally got a dr to prescribe Naturethroid, I started to feel better. Sadly, there’s been a Naturethroid shortage for a couple of years, so I’ve been on Armour….not quite as effective as Naturethroid, but still better than Synthroid.

    • J Swavely on June 19, 2023 at 12:54 am

      Get dessicated thyroid from forefront health

  17. RVR on June 19, 2023 at 2:19 am

    I’ve was on Synthroid for years with horrible sides effects. I heard of about thyroid armor from my own research. I started it a few months ago, I feel 100 times better. It has been a game changer.

  18. Mary Mary on June 19, 2023 at 4:24 pm

    Hi, Dr. Berg. I had a thyroidectomy 11 years ago. For 11 years I have been noticing a big change in my body, in my appearance, in my hair (which just seems to fall out of my head), but mainly, in my disposition. Gradually my ability to carry out my tasks was greatly reduced. I feel extremely tired, my bowel also works very poorly, I was already diagnosed with osteopenia even before I reached menopause and this scares the hell out of me! The worst thing is that I discovered that the higher the Vitamin D3, the more the PTH drops (mine is at 15), and the PTH is the only resource I still have to keep a little calcium in my organism (and the vitamin D3 is which increases intestinal absorption), so I find myself in a big dilemma about keeping D3 levels high and preserving my PTH.
    I always asked about how our body can maintain itself without calcitonin, but the doctors always ignored me. I have been without follow-up for 8 years, just looking for information like yours to take care of me. I developed a very big weakness in my teeth (cavities) and I still have bruxism (which prevents the possibility of restoring my teeth), I want to put a dental implant but I worry if I will have bone condition for it. I also developed digestive problems, depression, a lot of anxiety and panic because of hypoparathyroidism, any stress the calcium levels drop a lot, and these tingling in the face, spine, feet, or feet bending, are not easy to feel. Even to draw blood in the laboratory is a torment, I can’t keep that rubber attached to my arm for a long time, it seems that I can’t feel my arm anymore, it seems that it greatly reduces the supply of blood and calcium to it. It’s not easy to have this life, I’ve thought about putting an end to it many times. What I can say is that I am extremely grateful to Dr. Eric for so many teachings, you are an angel in our lives, because you really care about true health and well-being. Not even if I lived a thousand years would be enough to thank you.

  19. Nakkemies on June 19, 2023 at 9:27 pm

    I have hyperthyroidism, and noticed that certain foods and additives aggravates my thyroid. I have been on a elimination diet and it has helped to a degree. Always when ate something which i wasn’t supposed to eat, my thyroid levels went up like grazy. Next i have found that healing stomach is an important part and i think it is the biggest reason why i have thyroid problems. Found good strains of probiotics, prebiotics and supplements to heal my stomach and everything is going towards remission. What i think is that some foods what we eat makes some type of invasive species (bacteria, yeast, fungi) grow in our stomach and intestine lining, and body is trying to get rid of it. It ressembles as the thyroid and eye sockets, so as an side effect, anti-bodies goes destroying wrong tissues or blocking or activating things which it is not supposed to. It would be nice to have a larger study to know what are the thing which aggravate the thyroid from own personal experience. Would be nice to see if there is some resemblance each of us. Very nice would be an website to collect all the data of syntomps and personally found things which helps, and AI to compile the information.

  20. Maritza Caruth on June 21, 2023 at 10:04 pm

    Tysmfs this insight. I took the radioactive iodine 27 years ago at 23yo. Lately my back has been giving me much grief & I now understand why. You are truly a godsend Dr. Berg.

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