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Why Is My Hair Shedding? 8 Common Causes

This guide to hair shedding follows the same rule as our label: clear information leads to better decisions. The summary comes first, and the reasoning follows.

Hair Health · By The Gelagen Team · Updated 2026-08-31

The short answer

Sudden shedding is often telogen effluvium, triggered two to three months after stress, illness, surgery, crash dieting or childbirth. Low iron, thyroid problems and some medicines are other common causes.

Because scalp hair grows about a centimetre a month, three months of any routine gives you roughly three centimetres of new growth to judge. Patience is not optional with hair.

Telogen effluvium

A shock pushes many hairs into the resting phase at once.

The follicle is one of the fastest-dividing tissues in the body, which makes it sensitive to shortfalls in protein, iron, zinc and B vitamins. It is often among the first places a poor diet shows.

Nutrition

Low iron, protein or crash dieting commonly trigger shedding.

Normal shedding is 50 to 100 hairs a day. Noticing more in the shower after washing is expected; clumps, patches or a widening part deserve a doctor's view.

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Hormones and thyroid

Both can change the growth cycle.

Proven medical treatments exist for pattern hair loss, including topical minoxidil. Supplements support normal growth but are not substitutes for diagnosis and treatment.

See a doctor

Blood tests for iron, thyroid and vitamin D are worth asking about.

Hair is not alive once it leaves the scalp; all the biology happens in the follicle. That means nutrition and care affect the hair you grow next, while the lengths you already have can only be protected, not repaired from within.

A quick checklist

  • Keep heat tools at medium settings.
  • Choose loose styles over tight ones.
  • Ask your doctor about iron and thyroid tests.
  • Judge any routine after three months.
  • Photograph your part and hairline on day one.

Dermatologists see hair shedding as a symptom rather than a diagnosis. Iron, thyroid function, hormones, stress and medicines are checked first, because the right answer depends on the cause.

Putting it into practice

Mechanical damage from heat, tight styles and rough brushing causes a large share of the breakage people notice. Gentler habits protect the lengths while nutrition supports the roots.

Pick whichever tip above feels simplest and begin with it this week. Small early wins make the next habit easier, and routines grown gradually tend to survive far longer than big overnight overhauls.

Where Gelagen fits

A word about our own gummy: Gelagen works gradually over months, following the natural growth of skin, hair and nails, so it is a companion to good habits rather than a shortcut. The Gelagen discount packages start at $49 a bottle with a 60-day guarantee. You may also like our page on the Gelagen ingredients.

Common questions

Does biotin make hair grow faster?

It supports keratin; evidence for faster growth in people without deficiency is limited.

Can stress cause hair loss?

Yes, usually as shedding two to three months after a stressful event.

How long before hair supplements work?

At least three months, because hair grows about 1 cm a month.

Key takeaway

The short version: Sudden shedding is often telogen effluvium, triggered two to three months after stress, illness, surgery, crash dieting or childbirth. Build the simple habits first, give any change two to three months, and see a dermatologist about anything that worries you.

Before you order, please read this. Gelagen is a dietary supplement, not a treatment for any skin, hair or nail condition. Each serving contains 5,000 mcg of biotin, which the FDA warns can interfere with some lab tests, including thyroid and troponin tests, so tell your doctor before any blood work. Ask first if you are pregnant or nursing, have a thyroid condition or take prescription medicine. Keep gummies out of reach of children, and see a dermatologist about sudden hair loss, new rashes or a changing mole.

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