Iron and Ferritin: What They Are, Why They Matter, and Why Midlife Changes Everything
You asked your doctor to check your iron. The results came back "normal." But you are exhausted in a way that sleep does not fix, your hair is coming out in the shower, and your brain feels like it is running through wet concrete. Sound familiar?
Here is something that does not get talked about enough: normal is not the same as optimal. And when it comes to iron and ferritin, that distinction matters enormously, especially for women in perimenopause and menopause.
What Is Iron, and What Does It Actually Do?
Iron is a mineral your body cannot make on its own. You get it from food, and your body uses it to produce hemoglobin, the protein inside red blood cells that carries oxygen from your lungs to every tissue in your body. Without adequate iron, your cells are essentially oxygen-deprived. Everything slows down.
Iron also plays a role in energy production at the cellular level, immune function, thyroid hormone metabolism, and the synthesis of neurotransmitters like dopamine and serotonin. This is why low iron does not just make you tired. It can affect your mood, your cognition, your ability to regulate temperature, and your hair growth cycle.
What Is Ferritin, and Why Is It the Number That Actually Matters?
Ferritin is a storage protein. Think of it as your body's iron reserve tank. While serum iron tells you how much iron is currently circulating in your blood at a single moment in time, ferritin tells you how much your body has stored and available to draw from.
You can have a normal serum iron level and still be running on an almost empty ferritin tank. This is called iron deficiency without anemia, and it is extremely common in women, extremely underdiagnosed, and extremely responsible for symptoms that often get attributed to stress, depression, thyroid issues, or "just getting older."
The standard lab reference range for ferritin typically bottoms out around 12 to 15 ng/mL. Many conventional providers will look at a level of 14 and call it fine. But research and clinical experience consistently suggest that women feel and function best when ferritin is closer to 70 to 100 ng/mL. That gap between "not anemic" and "actually optimal" is where a lot of suffering lives.
Why Midlife Makes This Worse
During perimenopause, menstrual cycles often become heavier and more irregular before they stop. Heavy periods are one of the most significant drivers of iron loss in women, and if you are in your 40s having periods that are heavier than they used to be, your ferritin can drop faster than your body can replenish it through diet alone.
Add to that the fact that estrogen plays a role in iron absorption and regulation. As estrogen fluctuates and eventually declines in perimenopause, the body's ability to maintain iron balance can shift. Inflammation also tends to increase in the menopause transition, and chronic low-grade inflammation can suppress ferritin levels even when iron intake is adequate.
The result is a woman who is eating well, not technically anemic, and being told her labs are normal, while experiencing fatigue, hair thinning, brain fog, and mood instability that nobody is connecting to her iron stores.
Symptoms of Low Ferritin That Often Get Missed
If your ferritin is suboptimal, you might notice:
Persistent fatigue that does not improve with rest
Hair shedding or thinning, particularly at the crown and temples
Brain fog, difficulty concentrating, or poor memory
Shortness of breath with minimal exertion
Restless legs, especially at night
Cold hands and feet
Low mood or increased anxiety
Rapid heartbeat or heart palpitations
Brittle nails
Many of these symptoms overlap with perimenopause symptoms, thyroid dysfunction, and burnout. This is exactly why getting a full panel that includes ferritin, not just a basic CBC, is so important.
What to Do If Your Ferritin Is Low
If your ferritin comes back suboptimal, the approach depends on how low it is and what else is going on clinically. Options include:
Dietary iron. Heme iron from red meat, poultry, and seafood is the most bioavailable form. Plant-based sources like legumes, spinach, and pumpkin seeds contain non-heme iron, which absorbs less efficiently but still contributes. Pairing iron-rich foods with vitamin C improves absorption. Avoiding coffee or calcium-rich foods close to iron-rich meals also helps.
Supplementation. Iron supplements can be effective but need to be matched to your individual situation. The form matters, as some are better tolerated than others. Taking too much iron without clinical guidance is not without risk.
Addressing the root cause. If heavy periods are driving ongoing blood loss, that needs to be part of the conversation, not just the iron level.
The Bigger Picture
Ferritin is one of those markers that sits at the intersection of so many things women in midlife are struggling with. It is not glamorous, it is not the hormone conversation everyone wants to have, but it is often quietly contributing to why you feel the way you feel.
If you have never had your ferritin checked, or if you have been told your iron is fine but you still feel depleted, it is worth looking deeper.
At Evangeline Midlife, ferritin is part of the comprehensive lab panel we run on every new patient. Because treating the whole picture means looking at the whole picture.
Ready to find out what your labs are actually telling you? Schedule a consultation here.
Erin is a Women's Health Nurse Practitioner and Menopause Society Certified Practitioner at Evangeline Midlife in Bradenton, FL.
