If you've noticed more hair in the shower drain and a certain flatness to your skin, there's a marker worth knowing about: ferritin. It's the protein that stores iron, so it reflects how much iron your body actually has in reserve, and it's one of the more commonly overlooked numbers in women's health.
Why hair is the early signal.
Hair growth is metabolically expensive and, from the body's point of view, non-essential. So when iron reserves run low, hair follicles are among the first things the body deprioritizes. The result can be telogen effluvium: a diffuse, all-over shedding rather than bald patches.
The research links the two. In women with this kind of shedding, average ferritin levels tend to run meaningfully lower than in women without it (Kantor, 2003). It's worth being honest that the association isn't perfectly uniform, some studies find a weaker link, but low ferritin comes up often enough that it's a standard thing to check in unexplained hair loss.
Follicles are some of the first things the body deprioritizes when iron runs low.
The "normal" trap.
Here's the part that trips people up. Standard lab ranges call ferritin "normal" starting quite low, often around 15 nanograms per milliliter. But the level associated with healthy hair and energy sits higher than that floor. So a woman can be told her iron is "fine," have hair that's clearly thinning, and both things can be true, because "not anemic" and "enough iron for your hair" are different bars.
Skin feels it too. Iron supports the enzymes and oxygen delivery that keep tissue turning over; low reserves can leave skin looking dull and tired even before anything dramatic happens with your hair.
What to do.
If you're shedding, get your ferritin measured and look at the actual number, not just whether it cleared the low end of the range. It's easy to check and often straightforward to correct with your doctor. Ferritin is one of the nine markers on the JenSkin panel for exactly this reason.
A note: the JenSkin panel is a wellness tool, not a diagnostic test. This essay is for education, not medical advice, and cannot diagnose or treat any condition. For medical concerns, talk to your physician.
