Social media posts claiming that low iron levels produce visible facial changes, dubbed "ferritin face," have attracted millions of views across TikTok and Instagram. Users describe pale or grey-looking skin, dark under-eye circles, dry lips, hair shedding and weak nails as signs of depleted iron stores. But doctors say appearance alone cannot diagnose iron deficiency.
"Ferritin face is not a medical diagnosis," said GP Dr Aziza Sesay, based in the West Midlands. "However, it may be a clue to tell us that something is going on." Pale skin, hair shedding or brittle nails can accompany low iron but can also signal other conditions, she told BBC News.
Ferritin is a protein that stores iron in the body. Iron deficiency occurs when ferritin levels fall below 30 micrograms per litre, according to UK guidelines from the British Society of Gastroenterology. Absent iron stores show up at below 15 micrograms per litre.
Someone can be iron-deficient and have symptoms without being anaemic. "You've got no stored iron but you're maintaining your haemoglobin. That's the big disconnect," said consultant haematologist Dr Drew Provan. He said it is "impossible" to determine someone's ferritin levels from how their face looks. Pale skin may appear in people who are significantly anaemic, and fatigue can contribute to dark circles, but these signs are "subjective and unreliable," Provan explained.
In people with darker skin, changes in skin colour may be less obvious, Sesay added, meaning someone looking for the signs described online could miss iron deficiency entirely.
Lucy M, 32, who posts about hair loss on Instagram and TikTok as @marvluceskin, said she noticed changes in her skin and hair when her ferritin was 12 micrograms per litre in 2021. She developed heart palpitations, fatigue and hair loss and said she looked "grey" with dull, brittle hair. After treatment, she said the difference was "night and day."
Blood tests matter to confirm iron deficiency, establish its cause and guide treatment, doctors said. Heavy periods, low dietary intake, gastrointestinal blood loss and absorption problems can all contribute. Iron is commonly treated with oral tablets, best taken on an empty stomach without tea or coffee, as both inhibit absorption. Taking iron supplements without a diagnosis can be harmful and may delay investigation of underlying problems.
Dr Sue Pavord, a consultant haematologist, said iron deficiency is common and often under-diagnosed in women. Sesay called social media a "double-edged sword" because it can encourage people to seek help but can also lead to self-diagnosis from short videos.