Ferritin: the silent cause of fatigue your GP doesn't measure.
Your iron stores can sit nearly empty while your standard blood count looks perfect. Here's why we always check.
You have been tired for months. You sleep eight hours and wake up as if you slept four. You take the stairs and you're out of breath. You see your GP, you do the routine bloods, and the result comes back with one reassuring line: all within range.
Within range is not the same as thriving. It is a different thing.
What ferritin is, in two sentences.
Ferritin is the protein that stores iron in your body. When it is low, your cells struggle to produce energy, even if your standard blood count (the test your GP usually looks at) appears perfect.
Your blood count measures the iron circulating right now. Ferritin measures the iron in the tank. You can have the first look fine while the second is nearly empty.
Why almost nobody tests it.
It is not expensive. It is not hard to interpret. It simply isn't part of the standard annual checkup most people receive. And the reference ranges are built on the population average, an average that already includes a lot of deficient people.
In Italian labs, the lower end of ferritin often sits around 10 to 15 ng/mL. To feel genuinely well (stable energy, strong hair, a sharp mind) you want to be above 60 to 80.
What low ferritin actually feels like.
- Fatigue that coffee doesn't fix.
- Hair shedding, especially at the temples.
- Breathlessness on effort, like climbing stairs or going for a run.
- Feeling cold when everyone else is fine.
- Brain fog. Losing words that should be obvious.
These symptoms get mistaken for depression, burnout, or simply "life". In most cases, three months of properly dosed supplementation bring them down to zero.
What to do now.
If any of this sounds familiar, ask your doctor to add ferritin, transferrin, and transferrin saturation to your next test. If you are a Rosa member, they are already in your panel, alongside 107 other markers that tell similar stories.
