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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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Hair Loss Education

Hair Loss Causes 2025: The Complete Scientific Analysis of Why We Lose Hair

The definitive 2025 overview of all major hair loss causes, including hormonal, nutritional, genetic, inflammatory, and lifestyle-driven triggers.

D

Dr. Maya Castillo, Functional Nutritionist & Trichology Researcher

November 12, 2025
November 12, 2025
50 min read
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Published
November 12, 2025
Last updated
Nov 14, 2025
Diagram showing causes of hair loss: hormones, stress, deficiency, genetics
Diagram showing causes of hair loss: hormones, stress, deficiency, genetics

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

Understanding Hair Loss in 2025

Hair loss rates continue to rise, driven by stress, diet, and environmental factors. Modern science offers deeper insights into what triggers follicle miniaturization.

Genetic & Hormonal Causes

Androgenetic alopecia remains the top cause. DHT sensitivity varies by individual but can be managed with lifestyle and nutritional interventions.

Nutritional Deficiencies

Iron, zinc, vitamin D, and omega-3 deficiencies are major contributors to global hair thinning.

Stress, Cortisol & Inflammation

Chronic stress spikes cortisol, pushing follicles prematurely into the shedding phase.

Lifestyle Factors

Poor sleep, heavy alcohol consumption, and irregular meals weaken hair structure over time.

Environmental & Toxin Exposure

Air pollutants, microplastics, and heavy metals interfere with follicle function and scalp microbiome health.

How to Reverse the Damage

Address root causes: optimize nutrition, regulate hormones, reduce stress, and protect the scalp from environmental damage.

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.Understanding Hair Loss in 2025
  2. 02.Genetic & Hormonal Causes
  3. 03.Nutritional Deficiencies
  4. 04.Stress, Cortisol & Inflammation
  5. 05.Lifestyle Factors
  6. 06.Environmental & Toxin Exposure
  7. 07.How to Reverse the Damage

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