Supplements for hair loss and thinning hair

Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Hair, skin & nails

Diffuse hair shedding is commonly linked to low iron, low vitamin D, low zinc, or a thyroid problem; these are worth checking before blaming biotin.

Low ferritin is one of the most common reversible causes of diffuse hair thinning, particularly in women, and low vitamin D, zinc, and thyroid hormone are all associated with shedding. Biotin only helps in the rare case of a true biotin shortfall, so testing the others first is smarter.

Nutrients commonly linked

Iron Bisglycinate
See the guide →
Vitamin D3 + K2
See the guide →
Zinc Picolinate
See the guide →
Biotin
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Collagen Peptides
See the guide →

Biomarkers worth checking

These are the blood tests most relevant here. Knowing your numbers tells you whether a supplement is the right answer.

FerritinVitamin D (25-OH)ZincTSH
When to see a doctor

Patchy hair loss, a receding pattern, scalp scarring, or sudden heavy shedding should be assessed by a doctor or dermatologist, since the cause and treatment differ.

Beyond supplements

Enough protein, gentle hair handling, and treating the underlying deficiency matter more than any single hair pill. Important: pause high-dose biotin before blood tests, as it can skew them.

Common questions

What supplements help with hair loss and thinning hair?
Diffuse hair shedding is commonly linked to low iron, low vitamin D, low zinc, or a thyroid problem; these are worth checking before blaming biotin. The nutrients most often linked are Iron Bisglycinate, Vitamin D3 + K2, Zinc Picolinate, Biotin, Collagen Peptides.
Which deficiencies are associated with hair loss and thinning hair?
Low ferritin is one of the most common reversible causes of diffuse hair thinning, particularly in women, and low vitamin D, zinc, and thyroid hormone are all associated with shedding. Biotin only helps in the rare case of a true biotin shortfall, so testing the others first is smarter.
When should I see a doctor about hair loss and thinning hair?
Patchy hair loss, a receding pattern, scalp scarring, or sudden heavy shedding should be assessed by a doctor or dermatologist, since the cause and treatment differ.

Explore further

Find out what's actually low

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Educational use only, not medical advice, diagnosis, or treatment. Symptoms have many possible causes, and the nutrients here are commonly associated with this symptom, not a guaranteed fix. Always consult a qualified clinician, especially if symptoms are severe, persistent, or new.