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Supplements for hair, explained simply.

Most hair shedding is the body waving a flag, about iron, thyroid, stress, or protein. Here's the beginner version of what actually helps.

Here's the key idea: supplements help hair mainly when they correct a real deficiency. If your levels are already fine, more won't grow extra hair. So the smartest first step is usually a blood test, not a bottle.

The basics that actually matter

Fix the cause, not the symptom.

Iron / ferritin Moderate evidence

Iron stored in your body, measured as "ferritin."

Low ferritin is one of the most common causes of shedding, especially in women with heavy periods. Only supplement if a test confirms it.

Vitamin D Moderate evidence

The "sunshine" vitamin involved in the hair-growth cycle.

Deficiency is linked to more shedding. Common and easy to test.

Zinc Moderate evidence

A mineral needed for hair tissue growth and repair.

A genuine deficiency can cause hair loss, correcting it helps.

Protein Moderate evidence

Hair is mostly protein (keratin).

Crash diets and very low protein intake can trigger shedding. Eat enough first.

Biotin Only if deficient

The famous "hair vitamin", but true deficiency is rare.

It only helps if you're actually low. For most people it does little. And it carries an important safety catch (right).

Play it safe

The Stackwell way

We read your labs to find the real cause, screen every suggestion against your medicines, and grade everything honestly by evidence.

Get started   Check an interaction

Educational information only, not medical advice, diagnosis, or treatment. Always talk to your doctor or pharmacist before starting a supplement, especially if you take medication or have a health condition.