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FDA Shenanigans: Levothyroxine Increases Risk of All Cancers?

2.4KViews Published: May 7, 2026
By Jacqueline 9 Comments

FDA Shenanigans: Levothyroxine Increases Risk of All Cancers?
Image taken from the video below.

Dr. Bryan Ardis sounds an alarm on one of the most widely prescribed thyroid medications in America – levothyroxine. He also lists safer alternative helps below.

Levothyroxine, brand name Synthroid, is the main under-active thyroid medication prescribed by endocrinologists and doctors to over 22 million Americans, mostly women. For many years, the prevailing view was that Levothyroxine always worked and that TSH levels could be used to assess the adequacy of the treatment. (source)

There are now research papers that show that those views are flawed. (source)

Recent 2021 research suggests this FDA-approved drug (levothyroxine) may increase the risk of developing multiple cancers including brain, lung, breast, bladder, pancreatic, and other cancers.

The study was very, very large and included 601,733 cases of cancer and 2,406,932 controls. (source – see 3. “Results”)

This was not a small number of people being studied. It needs to be taken very seriously. There is a lot of nuance to this information, and it needs to be available to thyroid patients so that they can make informed decisions with their doctor regarding their own health.

Note: In the first minutes of the video, he starts with how the FDA has not taken this seriously. There has been a kind of switch and bait in their directives away from the safer alternatives (like Armour Thyroid and NP Thyroid) back to the very heavily used pharma drug he is warning about.

40 minutes.

The Receipts on Levothyroxine

FDA Shenanigans: Levothyroxine Increases Risk of All Cancers?

The study lists stomach, lung, breast, bladder, and brain cancers increase when levothyroxine is taken for more than a a year.

FDA Shenanigans: Levothyroxine Increases Risk of All Cancers?

There Is a Black Box Warning for Synthroid (Levothyroxine) 

Levothyroxine is the standard treatment for Hashimoto’s disease, which is an autoimmune disorder, but it doesn’t address the immune attack destroying your gland in Hashimoto’s, which is why many patients still feel unwell despite normal lab tests. Later, we see subsequent development of dementia of the Alzheimer type with long-term levothyroxine use.

“The probable role of thyroid hormones (like levothyroxine) in Alzheimer’s Dementia pathology has already been established, primarily in the area of beta amyloid plaque accumulation.” ~PubMed study

Why a Black Box warning?

• Doctors often prescribe Levothyroxine (Synthroid) for weight loss/obesity, but it is NOT effective for weight loss or obesity. Taking Levothyroxine (Synthroid) for a reason it doesn’t even address, INCREASES your risk for Dementia.

• Higher doses cause toxicity especially when used in combo with other weight loss aids (see warning in image below)

FDA Shenanigans: Levothyroxine Increases Risk of All Cancers?

NOTE FOR ALTERNATIVE HELP: Desiccated thyroid is much better tolerated than Levothyroxine by most, but doctors nowadays tend to be “afraid” of it. Drug companies saw it as competition and gave it a bad rap. It was THE safe standard practice before Synthroid was invented.

Desiccated thyroid has been on the market and safely used for more than 100 years. Until synthetic thyroxine (known generically as levothyroxine) was introduced in the 1950s, desiccated thyroid was the only thyroid hormone replacement medication. My mom and MANY others did very well on it all those years with no cognitive side-effects.

Medicare will not pay for any Thyroid medication that is natural. Will only pay for synthetics, SO check out GoodRX for NP Thyroid, Armour, Naturethroid, etc. , etc.. One reader said, “I can get my natural thyroid meds for less than what I’d pay with my insurance. If your doctor won’t let you use GoodRX because of Medicare, go to another pharmacy and do NOT give them your Medicare number.”

Ardis’s Answers To Hypothyroidism

At the timestamps below, this second video by Dr. Ardis shows:

(15:00-22:00) studies that Vitamin D deficiency is linked directly to hypothyroidism.

(22:00- 29:40) how increasing Vitamin C has a massively positive effect on T4 hormones (which is why they give you levothyroxin in the first place), memory, and prevents brain neuron damage.

(29:40- 34:00) the need for daily 200 mcg of Selenium for FSH and thyroid hormone conversion. It also reduced TPO antibodies at 3 and 6 months. “If you are on levothyroxin, you better be on selenium.”

(36:40- 40:00) how iodine and Magnesium deficiency often underlies hypothyroidism, Grave’s, hyperthyroid and Hashimoto’s.

Did You Know? Your Doctor Must Not Know This!!

Yale research found that “90% of the 23 million Americans taking levothyroxine may not need it —because diagnosing hypothyroidism is influenced by the season. “Typically, TSH tests higher in the winter. This is also when more people may experience symptoms of seasonal affective disorder (SAD), which can have symptoms similar to hypothyroidism. Many patients presenting with hypothyroidism-like symptoms are getting tested at a time when their TSH levels are naturally higher and being prescribed levothyroxine. But if many of those same people had gotten the same test a few months later, it would have come back as normal.” (source)

Red light therapy has been shown to be an effective treatment for Hashimoto’s in several studies.

Dietary recommendations can get complicated in a hurry, but the most simple way to look at food is in its ability to promote inflammation or reduce it. If you are looking to reduce inflammation, then eat plenty of protein, fiber, and omega-3 fatty acids. If you are looking to increase it, then eat plenty of processed foods, refined carbohydrates, and artificially flavored or sweetened foods. Specific to Hashimoto’s, think about seriously eliminating gluten, dairy, and soy. Diet remains one of the most powerful tools in treating Hashimoto’s, and patients report in some cases that it’s sufficient to put their disease into remission.

Two More Supplements: Besides the 4 listed in Dr. Ardis’s 2nd video above, here’s a list of the most well-studied:

  • Nigella sativa – One double-blind placebo-controlled trial of 40 patients showed that 2 grams of Nigella sativa improved thyroid function, reduced thyroid antibodies, and VEGF over 8 weeks (11).
  • Inositol – One study of over 80 patients with Hashimoto’s showed that the combination of myoinositol and selenium decreased TSH as well as TPO antibodies and thyroglobulin antibodies (13).

What’s important is awareness, because most people (doctors and patients included) aren’t aware that there’s anything beyond levothyroxine.

“It is better to take refuge in the LORD than to trust in humans.” ~Psalm 118:8

****For the Full Spike Protein Protocol to protect from transmission from the “V” and to help those who took the “V”, go here.

***If you found value in this writing, please share it, discuss it, and subscribe to my FREE newsletter. Ad-free, independent work like this spreads because of readers like you.

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Censorship is real, so my Pinterest account was suspended; thankfully, a big part of my main board is still alive through this link!

You can also find me on Facebook, Gab, MeWe, X (Twitter), and Instagram.

Medical Disclaimer: I am no longer a practicing medical professional, and I am not doctor. I am a mother. I do seek scientific confirmation of the safety and effectiveness of the herbs and remedies I use. Using remedies is a personal decision. Nothing I say on this blog is intended to treat or prevent disease. Consult your own doctor.

©2026 Deep Roots at Home • All Rights Reserved

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Hi! I’m Jacqueline!

Thanks for being part of this journey with me.
Welcome to my own little place on the internet! Home is where I love to be. I feel there is no greater place to incubate souls. These days you’ll find me using my experiences here to write about herbal remedies and natural health research — a big passion of mine. But being a wife and mother is not easy. It is challenging and potentially lonely. I get that. I wanted to create a place to connect with and support other moms for creating a natural, healthy, and fulfilling home life.
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