I Have an Under-Active Thyroid. What Is the Best Thing to Help Fatigue and Brain Fog?
15 Dec 2025 · 7 min
Dr. Alan Christensen, a naturopathic endocrinologist, explains why people with underactive thyroid feel fatigued and foggy. He recommends optimizing iodine intake (30-100 micrograms daily), checking iron levels (80-92% of thyroid patients have suboptimal iron), and ruling out sleep apnea and autoimmune gastritis. These issues can often be fixed rather than accepted.
Questions this episode answers
About 30 to 100 micrograms (µg) of iodine intake.
About 190 micrograms (µg) of iodine.
Approximately 80–92%.
Chapters
Hey, it's J.J. here. You know, I've been talking about environmental toxins forever, and laundry detergent is a sneaky one. A lot of them contain harsh chemicals like dyes, preservatives, and even UV brighteners. Those brighteners don't actually clean anything. They just coat fabric so your eyes think things look whiter or brighter. That's more chemicals I don't want on my family's sheets or skin. And if you've got sensitive skin or allergies around the house, this can be a big problem. That's what got my attention about Earth Breeze. It looks like a dryer sheet, but it's actually laundry detergent. You toss one in the washer and that's it. No pouring, no mess, and no heavy plastic jug. Their packaging is lightweight cardboard, which helps reduce plastic waste. And if you choose the fragrance free option, it's gentle, hypoallergenic, non irritating, and non sensitizing. I really like how simple it is and how fresh and clean everything comes out without those unnecessary chemicals. Right now you can try Earth Breeze for up to 40% off with free gifts@earthbreeze.com virgin that's earthbreeze.com virgin for up to 40% off plus free gifts on your first order. Hey, JJ here. Can you believe how fast the holidays are knocking at the door this year? One minute it's pumpkin spice season, the next you're getting your guest room ready and wondering where their wrapping paper went. And that's when I turned to Wayfair. From bedding and towels to holiday decor and last minute stocking stuffers, Wayfair has everything you need to get your home and holidays together fast. And for way less. With Wayfair, I know I can refresh my guest room in no time. Maybe I'll add a soft new comforter or a few holiday throw pillows. With Wayfair, it's so easy and everything arrives super fast. Plus, there's free shipping for any order over $35 easy and total peace of mind. So whether you're hosting, gifting, or just adding those final festive touches, Wayfair has your back. And when the holidays wind down, Wayfair has everything you need to tuck it all neatly away. Smart storage solutions for every room from the kitchen to the closet. Get organized, refreshed and ready for the holidays. For way less, head to Wayfair.com right now to shop all things home. Wayfair. Every style, every home that's W A Y f a I r.com this episode.
Is Brought to you by Corona. When you're on a beach with a nice cold Corona in hand, how can you not feel centered? But did you know you can get that vibe anywhere? That's because whether after work, at barbecues or at a bar with just a squeeze of lime, Corona brings you life. La Playa mentality. Because while we all want the beach life, paradise doesn't always have palm trees. Corona La Playa awaits. Get yours@orderkorona.com Relax responsibly. Corona Extra beer imported by Crown Import, Chicago, IL.
I have an underactive thyroid. What is the best thing to help with fatigue and brain fog? This is JJ Virgin, four time New York Times bestselling author, celebrity nutrition expert, and fitness hall of famer. I've been on a lifelong quest for answers to the toughest health questions and now I'm sharing what I found with you. Welcome to Ask the Health Expert. Irma Blanco from Facebook asks, I have an underactive thyroid. I'm currently taking 90 milligrams of armour. What's the best thing to help with fatigue and brain fog? Hey, it's JJ and today I've got my longtime friend Dr. Alan Christensen, also known as Dr. C, with me to answer this question. By the way, he's my thyroid doc too. He's a board certified naturopathic endocrinologist and New York Times best selling author from Minnesota, currently in Scottsdale, who fell in love with this awesome wife Kieran at first sight and they literally decide to get married on their first date. And that, by the way, was over 24 years ago. In his spare time, he's a huge athlete.
Including.
You'd never guess this mountain unicycling. You heard me right. We'll be right back with the answer. Stay with us.
Hey, J.J. virgin here. Okay, real talk. So often the holidays sneak up on me, travel, gifts, hosting, you know, all the things, and suddenly it's like, wait, who spent what and where? And I know I'm not the only one who's looked at a bill in January and thought, wow, that escalated quickly. If you want to keep your finances under control this holiday season, you need to be using Monarch. It's rated the Wall Street Journal's best budgeting app of 2025. Monarch is the all in one personal finance tool that brings your entire financial life together in one clean interface on your laptop or on your phone. Monarch lets you link everything and gives you real time visibility so you're not shocked later. Right now, I've been checking the holiday spending category so I Don't accidentally start the new year with that dreaded debt hangover. And honestly, just seeing everything laid out is already helping me stay more aware. This season, Monarch does the heavy lifting. It links your accounts in minutes, gives you smart categorization and super clear visuals. Yes, that end of year reset could be a real goal. This time, don't let financial opportunities slip through the cracks. Use the code virginonarch.com in your browser for half off your first year. That's 50% off your first year@monarch.com with the code Virgin this episode is brought.
To you by McAfee. I got a message that our flight was canceled, but they can put us on another flight and we just need to confirm our credit card info.
Wait, I got a security alert from McAfee. It flagged that message as a scam.
McAfee's scam detector automatically spots and alerts.
You to suspicious texts, emails and deep fake videos.
Learn more@mcafee.com online protection.
So if you've got an underactive thyroid and you're already on medication, the best thing to help with fatigue and brain fog. So there's a couple steps to that. The first one is thinking about improving your own thyroid function as much as possible. And that'll come about by your thyroid making more hormone. And the best opportunity that helps that is getting right. In terms of iodine, what we learned now is that thyroid disease becomes active and the thyroid slows down from a variety of factors. But a lot of the factors that we thought were common we now know are not that common. And of the ones that are the most common, there's some that we can't do much with. And that would include how old we are and the fact of our genders. But the variable which is the most common driver that is controllable is going to be our iodine status. We've learned that there's a window that if you're outside this particular window, you're much more apt to develop thyroid disease. And the exciting part is there's another window that if you're inside of it, you've got the best odds of reversing thyroid disease. And that's somewhere between about 30 and 100 micrograms. Now that's how much iodine you ingest. And when you're taking 90 milligrams of armor, you're already getting do some quick math. You're already getting about 190 micrograms of iodine right there. So you wouldn't want any extra. So the more that you can avoid extra iodine, the more your gland has a chance to heal itself. The biggest sources to think about would be iodized salt, dairy foods, egg yolks, see vegetables and then processed and baked grain products, and then finally some cosmetics. There are topical compounds that are quite dense in iodine. The next steps to think about with the brain fog and fatigue are making sure your thyroid levels are appropriate. So if your medication is too high or too low, either one can make you not feel well. It's not always a matter of the more the merrier. And then another big thing to think about is whether there are other factors. So there's many conditions that are common in the same people that get thyroid disease, and there's some conditions that thyroid disease can cause, but one of the most common ones with those symptoms would be anemias. Somewhere between about 80 to 92% of people with thyroid disease do not have the best levels of iron, and a common way that can affect them is just generalized fatigue and brain fog. But there are some other conditions too that can be present. Things like autoimmune gastritis, parathyroid disease, sleep apnea. So the trick is to dial in your thyroid, help it as much as possible, and then work with a good doctor to make sure there aren't any other hidden factors making you not feel well. But those are the steps. But please know that those are not symptoms you've got to live with. Those are things that can be understood and can be improved upon.
This is JJ with Ask the Health Expert. I do this five times a week, so make sure you never miss a show by going to subscribetojay.com.
Hello listeners, this is Anne Bogle, author, blogger, and creator of the podcast what Should I Read next? Since 2016, I've been helping readers bring more joy and delight into their reading lives. Every week I tag all things books and reading with a guest and guide them in discovering their next read. They share three books they love, one book they don't, and what they've been reading lately. And I recommend three titles they may enjoy reading. Next. Guests have said our conversations are like therapy troubleshooting issues that have plagued their reading lives for years and possibly the rest of their lives as well. And of course, recommending books that meet the moment. Whether they are looking for deep introspection to spur or encourage a life change, or a frothy page turner to help them escape the stresses of work, school, everything, you'll learn something about yourself as a reader and you'll definitely walk away confident to choose your next read, with a whole list of new books and authors to try. So join us each Tuesday for what should I Read Next? Subscribe now wherever you're listening to this podcast and visit our website, whatshould I Read Next Podcast. Com to find out more.
More from JJ


Healthy Revisit: Heavily Meditated - Transforming Your Emotional Landscape with Dave Asprey






