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Based in the United States — Evidence-based hair loss information following AAD & FDA guidelines.

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Maya Castillo is a US-based, US-trained hair science writer and research editor specializing in hair growth, scalp health, and evidence-based wellness. She follows AAD (American Academy of Dermatology) guidelines and translates complex scientific research into practical guides to help readers make informed decisions about their hair health.

maya.castillo@besthairregrowth.comLearn more about Maya →

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Science

How Hormones Affect Hair Health: Understanding DHT, Estrogen, and Thyroid Links

Hormones are central to hair growth and loss. Learn how DHT, estrogen, and thyroid balance influence your scalp health.

D

Dr. Laila Monroe, MD, FAAD

November 7, 2025
November 7, 2025
7 min read
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Published
November 7, 2025
Last updated
Nov 8, 2025
Hormone balance and hair growth concept
Hormone balance and hair growth concept

Affiliate Disclosure: This article contains affiliate links. We may earn a commission at no extra cost to you.

DHT and Hair Loss

DHT, a derivative of testosterone, is the primary cause of androgenetic alopecia. It binds to receptors in scalp follicles, leading to shrinkage and thinning.

Estrogen and the Hair Cycle

Estrogen prolongs the anagen phase, explaining why women often have thicker hair during pregnancy. Drops in estrogen postpartum or during menopause can trigger shedding.

The Thyroid Connection

Both hyperthyroidism and hypothyroidism can disrupt the hair cycle. Correcting thyroid imbalance is essential for restoring healthy regrowth.

Recommended US Products

These evidence-based hair loss treatments are available in the United States and have been reviewed for safety and efficacy:

  • •Rogaine (Minoxidil) - FDA-approved topical treatment
  • •Keeps - Subscription-based hair loss solutions
  • •Hims - Comprehensive hair care products and treatments
  • •Nutrafol - Science-backed hair growth supplements
  • •Vegamour - Plant-based hair wellness products

Always consult with a US-licensed dermatologist or healthcare provider before starting any new treatment. Products mentioned are for informational purposes only.

Have Questions?

Consult with a dermatologist or healthcare provider before starting any new hair loss treatment. Always read labels and follow instructions carefully.

Coming soon...

Table of Contents

  1. 01.DHT and Hair Loss
  2. 02.Estrogen and the Hair Cycle
  3. 03.The Thyroid Connection

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