Exhausted all the time? Before you reach for another iron supplement, read this.
If you're a woman who's been dragging herself through the day, chances are someone has suggested you're low in iron. And look, they might be right—iron deficiency is genuinely exhausting. But here's what I see time and again in practice: women taking iron supplements religiously, yet still feeling absolutely shattered.
If that's you, it's not because you're not trying hard enough. It's because your fatigue might be coming from somewhere else entirely.
Your Thyroid Might Be the Real Culprit
This is huge, especially for women over 35. Your thyroid is basically your body's metabolic control center—it regulates everything from your temperature to how your cells produce energy. When it's even slightly underactive (yes, even subclinically), you can feel like you're wading through treacle every single day.
Here's the thing: you can't diagnose thyroid issues based on symptoms alone. You need proper bloodwork—TSH, free T4, free T3, and sometimes reverse T3 and thyroid antibodies. It gives us the full picture.
What to look out for: constantly cold hands and feet, hair that's thinning more than usual, ongoing constipation, puffiness, and waking up feeling like you haven't slept at all—even after eight hours.
I’m incredibly passionate about helping women with their Thyroid health. This is due to me finding out I had mild thyroid dysfunction myself a few years into perimenopause. I did further training in this space to help myself and others.
Stress Has Physically Changed How Your Body Makes Energy
Remember when everyone was talking about "adrenal fatigue"? Well, the science has moved on, and what we're really looking at is something called ‘HPA axis dysregulation’. Basically, chronic stress—whether it's emotional upheaval, physical demands, or hormonal chaos—disrupts the communication between your brain and adrenal glands.
The result? Your cortisol patterns go haywire, your sleep suffers, and your energy becomes completely unreliable.
Sound familiar? Struggling to get going in the morning, craving sugar like it's your job, brain fog that won't lift, and that soul-destroying 3 p.m. slump.
What helps: gentle movement (not punishing workouts), genuinely restorative sleep, eating regular balanced meals, and herbs like Ashwagandha, Rhodiola, or Licorice root can be incredibly supportive. Just please chat with your healthcare practitioner before starting anything new, especially if you're on medications.
The Iron Test That Might Be Lying to You
Here's where it gets tricky. Most people get their ferritin tested (that's your stored iron) and assume that tells the whole story. But ferritin also shoots up when you have inflammation in your body. So you could have "normal" or even high ferritin levels but still be functionally low in iron if inflammation or thyroid issues are interfering.
And the flip side? Taking iron when you don't actually need it can cause real harm. Iron overload creates oxidative stress and puts strain on your organs.
Bottom line: only supplement iron when you've got proper confirmation from comprehensive testing—ferritin, serum iron, transferrin saturation, and inflammatory markers like CRP. More isn't always better.
Your Gut Might Not Be Doing Its Job
You could be eating all the iron-rich foods and taking your supplements perfectly, but if your gut isn't absorbing nutrients properly, you're basically pouring water into a leaky bucket.
Low stomach acid, SIBO, intestinal inflammation, or gluten sensitivity can all sabotage nutrient absorption. Plus, a healthy gut microbiome actually helps recycle iron efficiently—who knew?
Quick win: when you eat iron-rich foods (think grass-fed red meat, lentils, spinach), pair them with vitamin C sources like capsicum or citrus. And skip the tea or coffee with meals—they interfere with iron absorption.
Iron Isn't the Only Player in Your Energy Game
Your cells need more than just iron to make energy. Your mitochondria (the little power plants in your cells) also rely on B vitamins, magnesium, carnitine, and CoQ10 to convert food into usable energy (the techincal term is ATP for the science boffins amongst us).
Stress, restrictive diets, or just not eating enough nutrient-dense food can leave you deficient in these crucial cofactors.
Worth considering: a good quality whole-food B-complex, magnesium glycinate, and loading up on antioxidant-rich foods like berries, leafy greens, and olive oil. Again, run it past your practitioner first, particularly if you have existing health conditions or take medications.
Sleep and Blood Sugar: The Dynamic Duo You're Overlooking
If your blood sugar is on a roller coaster, or cortisol is surging at night when it should be nice and low, your sleep quality tanks—even if you're technically in bed for eight hours. And if you're in perimenopause? Those hormone fluctuations can make this so much worse.
The simple fix that makes a real difference: build your meals around protein, fiber, and healthy fats. This stabilizes your blood sugar and prevents those awful energy crashes.
Here's What Actually Matters
If you've been treating suspected iron deficiency but you're still exhausted, your body is trying to tell you something. Fatigue is almost never about just one nutrient—it's a whole-system issue involving your thyroid, stress hormones, inflammation, gut function, and cellular energy production.
What you need is a proper assessment that looks at the big picture, not just one number on a blood test. That's how we figure out what's really going on and get you back to feeling like yourself—without drowning in supplements you might not even need.
What to Do Next
If you're tired of being tired:
Get comprehensive testing. Request a full fatigue panel including iron studies, thyroid function, cortisol patterns, inflammatory markers, and key nutrient levels.
Look at your gut health. If absorption is the issue, no amount of supplementation will fix things until we address that.
Work with someone who gets it. Find a Naturopath or Integrative Practitioner who can interpret your results in context and see you as a whole person, not just a collection of lab values.
There's always a reason you're not feeling right. We just need to find it.
Hope this helps, have a great week! Lisa
