Hair Loss Learning Center
One place with in-depth information, up-to-date research, and practical tools
for anyone dealing with hair loss and looking for science-based solutions.
From approved treatments to the latest breakthroughs. Find quotes from scientific papers, links to research, and practical guides.
What is Hair Loss?
Basic understanding of the condition
Types & Comparison
Androgenetic, alopecia areata, telogen and more
Treatments & Medications
Approved and innovative medications
Clinical Trials
Active research and drugs in development
New Research
Breakthroughs and discoveries 2025
Hair Loss in Women
Hormonal, postpartum, treatments
Hair Transplant
FUE, FUT, new technologies
Natural Remedies
Supplements and herbal treatments
Psychological Impact
Depression, anxiety and self-image
Links & Resources
Organizations, clinics and further information
What is Hair Loss?
An in-depth understanding of the condition, types, causes, and prevalence
What is Hair Loss?
Hair loss (Alopecia) is a condition in which hair falls out from the scalp or other areas of the body. Losing up to 100 hairs per day is considered normal. When shedding exceeds this, or when hair follicles stop producing new hair, it is considered pathological hair loss requiring medical evaluation.
Main Causes
Causes are varied: genetics (heredity), hormonal changes (DHT, thyroid), autoimmune diseases, psychological stress, nutritional deficiencies (iron, zinc, biotin), medications (chemotherapy, anticoagulants), and environmental factors.
When to See a Doctor
When hair loss is sudden and in large amounts, when bald patches appear, when there is itching or pain on the scalp, when hair loss is accompanied by other symptoms (fatigue, weight changes), or when hair loss persists for more than 3 months without improvement.
The Hair Growth Cycle
Each hair has a three-stage life cycle: Anagen (growth phase, 2 to 7 years, 85% of hair), Catagen (transition phase, 2 to 3 weeks), and Telogen (resting and shedding phase, 2 to 3 months). Disruption of this cycle is the basis of most types of hair loss.
Frequently Asked Questions
Types of Hair Loss
A detailed comparison of the main types
| Type | Cause | Characteristics | Reversibility |
|---|---|---|---|
| Androgenetic (AGA) | Genetics + DHT hormone | Gradual thinning, receding hairline in men, widening part in women | Slowed with treatment, not fully reversible |
| Alopecia Areata (AA) | Autoimmune | Round bald patches, can occur at any age | 50% regrow within a year; new JAK inhibitors available |
| Telogen Effluvium (TE) | Stress, illness, medications | Diffuse shedding, 2 to 4 months after a trigger | Fully reversible in most cases |
| Alopecia Totalis | Severe autoimmune | Complete loss of hair on the scalp | Difficult to treat; responds to JAK inhibitors |
| Alopecia Universalis | Severe autoimmune | Complete loss of hair on the entire body | Affects ~1% of cases; responds to JAK inhibitors |
| Scarring Alopecia | Inflammatory, destructive | Irreversible destruction of hair follicles | Not reversible; early treatment is critical |
Androgenetic Hair Loss in Men
The most common type, accounting for 37.7% of all hair loss cases. The hormone DHT (Dihydrotestosterone) gradually shrinks hair follicles. It begins with a receding hairline and thinning at the crown. 50% of men are affected by age 50 and 80% by age 70 (StatPearls, NCBI).
Alopecia Areata
An autoimmune disease in which the immune system attacks hair follicles. It appears as round bald patches. Affects approximately 2% of the global population. 20% of cases occur in children. Higher prevalence in Asian, African, and Latino populations (Nature, 2025).
Telogen Effluvium
Temporary hair loss caused by stress. Triggering events include: surgery, acute illness (including COVID), childbirth, extreme dieting, stopping birth control, severe psychological stress. Occurs 2 to 4 months after the trigger. In most cases resolves on its own within 6 to 12 months.
Warning Signs of Scarring Alopecia
Scarring alopecia is rare but serious. Signs include: itching or pain on the scalp, redness around hair follicles, scales that cling to the hair root. If these signs are identified — seek urgent dermatological care. Early treatment can prevent irreversible follicle destruction.
Treatments & Medications
Approved medications, innovative therapies, and what to ask your doctor
Minoxidil (Rogaine)
FDA Approval: 1988
Form: Topical solution or foam
Mechanism: Dilates blood vessels in the scalp, extends the growth (anagen) phase
Efficacy: A 2022 meta-analysis showed a 12% to 18% increase in hair count after 6 months with 5% concentration
For: Men and women with androgenetic hair loss
Side effects: Local irritation, unwanted facial hair growth (women), low blood pressure (rare)
Finasteride (Propecia)
FDA Approval: 1997
Form: Daily pill (1mg)
Mechanism: Inhibits 5-alpha reductase enzyme, reduces DHT by 70%
Efficacy: A long-term study (10 years) showed stabilization or regrowth in 86% of patients
For: Men only (FDA approved)
Side effects: Decreased libido (1% to 2%), erectile dysfunction (rare, reversible)
Dutasteride (Avodart)
Approval: Off-label for hair loss (approved for BPH)
Form: Daily pill (0.5mg)
Mechanism: Inhibits both types of 5-alpha reductase (I and II), more potent than finasteride
Efficacy: Studies show superiority over finasteride in hair count
For: Men who did not respond to finasteride
Side effects: Similar to finasteride, similar frequency
New: Low-Dose Oral Minoxidil
More and more dermatologists are prescribing low-dose oral minoxidil (0.625mg to 5mg) as an alternative to topical treatment. A biopharmaceutical company is in Phase 3 of clinical trials developing oral minoxidil specifically for hair loss. If approved, this would be the first new prescription medication for patterned hair loss in nearly 30 years.
The JAK Inhibitor Revolution for Alopecia Areata
Since 2022, the FDA has approved three JAK inhibitors for the treatment of severe alopecia areata. These are the first medications approved specifically for this disease, and they represent a genuine revolution.
Baricitinib (Olumiant)
Approval: June 2022, the first approved
Form: Daily pill, JAK1/JAK2 inhibitor
Efficacy: 32% to 35% of patients achieved 80% or more scalp coverage after 36 weeks (4mg dose)
For: Adults with severe alopecia areata
Ritlecitinib (Litfulo)
Approval: June 2023
Form: Daily pill, JAK3/TEC inhibitor
Efficacy: 40% of patients achieved 80% or more scalp coverage after 48 weeks
For: Ages 12 and older — the first medication approved for adolescents as well
Deuruxolitinib (Leqselvi)
Approval: 2024
Form: Daily pill (8mg), JAK1/JAK2 inhibitor
Efficacy: Over 30% achieved 80% or more coverage after 24 weeks; up to 25% achieved 90% or more coverage
For: Adults with severe alopecia areata
Important to Know About JAK Inhibitors
JAK inhibitors are immunosuppressive medications. Possible side effects include: upper respiratory tract infections, headaches, acne, elevated cholesterol. Periodic blood monitoring is required. These medications do not cure the disease — hair loss may return if treatment is stopped.
PRP — Platelet-Rich Plasma
What it is: A treatment using the patient's own plasma, enriched with growth factors
Process: Blood draw → centrifugation → injection into the scalp
Efficacy: Studies show improvement in hair density and thickness, especially combined with other treatments
Frequency: A series of 3 to 4 treatments one month apart, then maintenance every 3 to 6 months
Corticosteroid Injections
For: Primarily for alopecia areata (bald patches)
What it is: Injection of corticosteroids directly into the bald area
Efficacy: High for limited patches; hair regrows within 4 to 8 weeks
Limitation: Not suitable for large areas; may cause local skin thinning
Low-Level Laser Therapy (LLLT)
What it is: Home devices (helmets, combs) that emit low-level laser light
Mechanism: Increases blood flow and cellular activity in follicles
Efficacy: FDA-cleared as a medical device; studies show modest improvement
For: As a complement to other treatments, not as a standalone therapy
Important Questions for Your Doctor Visit
Being prepared for your appointment can make a real difference. Here are questions worth asking:
Diagnosis
What is the exact type of my hair loss? Do I need additional tests (blood tests, biopsy)? Is there an underlying medical condition that needs to be treated?
Treatment
What treatment options are relevant to my condition? When can I expect to see results? What happens if I stop treatment? Are there new medications worth considering?
Expectations
What is a realistic prognosis for my situation? Is the hair loss expected to continue? Is a hair transplant right for me? What are the risks and benefits of each option?
Clinical Trials
Drugs in development and active research shaping the future
Clascoterone 5% (Cosmo Pharmaceuticals)
The first topical androgen receptor inhibitor of its kind for androgenetic hair loss in men. In two identical Phase 3 studies, it showed improvements of 539% and 168% in hair count (TAHC) compared to placebo. Cosmo is expected to submit for FDA and EMA approval in spring 2026 (Dermatology Times, December 2025).
PP405 (Pelage Pharmaceuticals / UCLA)
A small molecule that awakens dormant stem cells in hair follicles. In Phase 2a, 31% of patients showed a 20% or greater increase in density. Pelage raised $120 million (Series B, October 2025) to advance Phase 3 in 2026. If approved, this would be the first treatment to restore dormant follicles (UCLA Newsroom).
Oral Minoxidil (Phase 3)
A biopharmaceutical company completed Phase 3 for oral minoxidil specifically designed for patterned hair loss in men and women. If approved, this would be the first new prescription medication for hair loss in approximately 30 years (American Salon, 2025).
Exosome and Stem Cell Therapies
Exosome therapy and secretome represent a new generation of regenerative medicine. These are tiny vesicles containing growth factors, peptides, and proteins that communicate directly with follicle cells. Shiseido launched in Japan (July 2024) an autologous stem cell (DSC)-based treatment with promising results.
Gene Therapy and Antibody Treatments
Researchers are developing gene therapies targeting specific molecular pathways involved in the hair growth cycle. Antibody therapies offer high precision in targeting key pathways. Regenerative treatments based on autologous stem cells may enter early commercialization by late 2026 (BioInformant).
How to Find Clinical Trials
The website ClinicalTrials.gov is the world's largest registry. Search for "alopecia" or "hair loss" and filter by location and status (Recruiting). Major academic medical centers worldwide regularly participate in international hair loss trials.
New Research
Scientific breakthroughs from 2025 and 2026
PP405 Molecule — UCLA
Scientists at UCLA identified a small molecule that can awaken dormant but intact hair follicles. Unlike existing treatments that slow shedding, PP405 targets the restoration of active growth. First human trials (Orange County) showed very encouraging results (UCLA Newsroom, 2025).
AI for Early Diagnosis
In 2025, startups and dermatology platforms began deploying AI systems to analyze scalp and hair via smartphone photos. The systems detect early signs of alopecia before hair loss is visible to the naked eye — enabling earlier and more effective intervention (Hair Loss Review Centre, 2026).
The Scalp Microbiome
New research is investigating the link between the composition of scalp bacteria and hair health. 2026 is marked as "the year of the microbiome" in the hair field, with discoveries about how specific bacteria affect local inflammation and the follicle life cycle (Hair Loss Review Centre).
Stem Cells — Shiseido in Japan
Shiseido launched in July 2024 in Japan a regenerative stem cell-based treatment: extraction of DSC (Dermal Sheath Cup) cells from the patient, laboratory multiplication, and injection back into the scalp. Clinical studies demonstrated safety and efficacy in androgenetic hair loss in both men and women (BioInformant, 2026).
Clascoterone — Topical Androgen Inhibitor
Two large Phase 3 studies proved that Clascoterone 5% solution is significantly effective in androgenetic hair loss in men. The mechanism: direct blockade of androgen receptors in the scalp, without systemic effects. FDA submission expected in spring 2026 (STAT News, December 2025).
GLP-1 and Hair Loss?
GLP-1 medications (such as Ozempic and Wegovy) are now being studied in the context of hair. An article in Drug Discovery News (2025) asked: "Could hair loss become the next GLP-1 moment?" — referring to massive investment in a field with enormous market potential.
Up-to-Date Research Sources
All information in this portal is based on papers from PMC/PubMed, STAT News, Dermatology Times, Nature Scientific Reports, BioInformant, UCLA Newsroom, and clinical trials registered at ClinicalTrials.gov. Publication dates: 2024 to 2026.
Hair Loss in Women
Hormonal causes, postpartum hair loss, and targeted treatments
Female Pattern Hair Loss (FPHL)
Different from the male pattern: manifests as diffuse thinning and widening of the part, usually without a receding hairline. Triggers: genetics, androgen sensitivity, menopause, polycystic ovary syndrome (PCOS). Treatment: Minoxidil 2% or 5% (FDA-approved for women), spironolactone (the most common anti-androgen, off-label).
Postpartum Hair Loss
Occurs in 40% to 50% of women. Reason: During pregnancy, high estrogen levels extend the growth phase. After delivery, hormones return to normal and a large amount of hair simultaneously enters the shedding phase. Timing: Begins 3 to 4 months after delivery, lasts up to 12 months. Important: This is a temporary and natural phenomenon (Cleveland Clinic, Johns Hopkins).
Other Hormonal Causes
Thyroid gland: Both underactive and overactive thyroid cause hair loss.
Birth control pills: Starting or stopping can trigger telogen effluvium.
Menopause: Decline in estrogen and relative increase in androgens.
PCOS: Excess androgens, hair loss combined with excess body hair.
Approved Treatments for Women
Minoxidil: FDA-approved for women (2% and 5%). Spironolactone: The most common anti-androgen for female hair loss (off-label, PMC 2018). PRP: Especially effective combined with minoxidil. Iron and Vitamin D supplements: Essential when deficient (common after childbirth and breastfeeding). Important: Finasteride is contraindicated in women of childbearing age (risk of fetal harm).
Hair Transplant
Techniques, success rates, costs, and what you need to know
FUE — Follicular Unit Extraction
What it is: Extraction of individual follicular units from the donor area (usually the back of the head) using a microscopic device, and transplanting them into the bald area.
Advantages: No linear scar, faster recovery (5 to 7 days), suitable for short haircuts.
Disadvantages: More expensive than FUT, longer procedure time, fewer grafts in a single session.
Cost: $4 to $10 per graft, total $6,000 to $15,000.
New technologies: ARTAS robotic system, NeoGraft device, SAFE system, and PCID system reduce complications and increase precision.
FUT — Follicular Unit Transplantation (Strip)
What it is: Removal of a narrow strip of skin from the back of the head, cutting it into micro-units, and transplanting them into the bald area.
Advantages: More grafts can be transplanted in a single session, lower cost per graft.
Disadvantages: Linear scar at the back of the head, longer recovery (10 to 14 days).
Cost: $3 to $7 per graft, total $4,000 to $15,000.
| Criterion | FUE | FUT |
|---|---|---|
| Scar | Tiny dots | Linear line |
| Recovery | 5 to 7 days | 10 to 14 days |
| Grafts per session | Up to 4,000 | Up to 5,000+ |
| Graft survival | 95% to 98% | 95% to 98% |
| Cost per graft | $4 to $10 | $3 to $7 |
When is a Hair Transplant Not Recommended?
A transplant is not recommended when: hair loss is not yet stable (wait for stabilization), there is insufficient donor hair, you have active alopecia areata (the immune system may attack transplanted grafts too), expectations are not realistic, or when the cause is nutritional or hormonal and can be treated otherwise.
Natural Remedies & Supplements
What science says about natural treatments for hair loss
Disclosure
Supplements and natural treatments are not a substitute for medical treatment. The efficacy of some is supported by research, but the level of evidence is lower than that of prescription medications. Consult a doctor before starting any treatment.
Saw Palmetto
Mechanism: Inhibits 5-alpha reductase, reduces DHT (similar to finasteride, but weaker).
Studies: 5 randomized controlled trials and 2 cohort studies showed: 60% improvement in hair quality, 27% increase in hair count, increased density in 83.3% of patients (PMC, 2020).
Dose: 100 to 320 mg per day.
Evidence level: Moderate — the best among natural remedies.
Rosemary Oil
Mechanism: Contains rosmarinic acid, camphor, and anti-inflammatory compounds that increase blood flow to the scalp.
Studies: Research shows efficacy comparable to 2% minoxidil as a topical treatment, with fewer side effects (PMC, 2024).
Use: Massage diluted in a carrier oil, 2 to 3 times per week.
Evidence level: Moderate.
Pumpkin Seed Oil
Mechanism: Beta-sitosterol and linolenic acid inhibit 5-alpha reductase and reduce inflammation (IL-6).
Studies: A randomized double-blind trial (PMC, 2014) showed a 40% increase in hair count after 24 weeks versus placebo.
Dose: 400 mg per day (capsules) or topical use.
Evidence level: Limited, based on one key study.
Biotin (Vitamin B7)
Mechanism: Essential for keratin production.
The truth: Effective only when there is a proven deficiency (rare in the general population). If biotin levels are normal, supplementation will not improve hair loss. Important: Biotin interferes with blood tests (thyroid, troponin) — stop 72 hours before testing.
Evidence level: Weak for general hair loss, strong only in deficiency.
Nutrition & Minerals
Iron: Iron deficiency is a common cause of hair loss, especially in women. Check ferritin levels.
Zinc: Essential for follicle function; deficiency is common in restrictive diets.
Vitamin D: Deficiency is associated with alopecia areata.
Protein: Hair is 90% keratin (protein). Low-protein diets cause hair loss.
Omega-3: Anti-inflammatory properties that support scalp health.
Caffeine & Melatonin
Caffeine: Studies show that topical caffeine promotes hair follicle growth and counteracts the inhibitory effect of DHT in the laboratory. Caffeine-based shampoos are commercially available.
Melatonin: Topical melatonin solutions have shown promising results in several studies on androgenetic hair loss (PMC, 2024).
The Psychological Impact
Depression, anxiety, self-image and coping strategies
Anxiety & Depression
A systematic review (PMC, 2023) found that androgenetic hair loss is a significant psychosocial stressor. Common symptoms include: anxiety, anger, depression, embarrassment, loss of self-confidence, social withdrawal, and in extreme cases, suicidal thoughts. The link between hair loss and anxiety is statistically significant (meta-analysis, PMC 2025).
Impact on Women
Women report higher levels of anxiety than men in the context of hair loss. The impact is especially strong in women with non-scarring alopecia, who reported difficulties in personal relationships and daily functioning. 88% of women who sought treatment reported a negative impact on daily life, and 75% reported damage to self-confidence (AJMC).
Impact on Young People
Younger and middle-aged patients reported greater quality-of-life impairment and higher anxiety levels than older adults. This makes sense — hair carries greater aesthetic and identity value at a younger age. 20% of alopecia areata cases are in children, adding unique social challenges (Yale Medicine).
What Helps?
Research from 2025 shows that supportive interventions such as body image therapy, group counseling, and structured psychosocial support programs significantly reduce emotional distress among people dealing with chronic hair loss (PMC, 2025). Support groups (online and in-person) are also reported as highly effective.
Links & Resources
International organizations, research tools, and key information
Leading International Organizations
National Alopecia Areata Foundation (NAAF)
The world's leading organization for alopecia areata research and support. Provides information, research funding, community, and support groups for patients and families worldwide.
naaf.orgAlopecia UK
A UK-based charity supporting people affected by alopecia. Offers helplines, support groups, information resources, and advocacy for better treatment access.
alopecia.org.ukAlopecia World
A global online community for people living with all forms of alopecia. Connects patients worldwide for peer support, information sharing, and community building.
alopeciaworld.comAmerican Academy of Dermatology (AAD)
The leading professional organization for dermatologists. Provides patient education resources, treatment guidelines, and a dermatologist locator tool.
aad.orgResearch & Search Tools
ClinicalTrials.gov
The world's largest registry of clinical trials. Search "alopecia" or "hair loss" and filter by status (Recruiting) to find active trials worldwide.
Find TrialsPubMed — Research Papers
The world's largest database of medical research. Search for the latest hair loss and alopecia studies.
PubMedDermNet NZ
A comprehensive, peer-reviewed dermatology resource covering all types of hair loss with patient-friendly and clinical information.
DermNet NZHair Loss Review Centre
An independent resource reviewing treatments, research, and news in the hair loss field. Covers the latest breakthroughs and clinical developments.
Hair Loss ReviewKey Research Articles
Approved Treatments
- Minoxidil meta-analysis — PMC Review — efficacy and safety
- Finasteride 10-year study — NEJM — long-term outcomes
- Baricitinib for Alopecia Areata — NEJM 2022
- Ritlecitinib — NEJM 2023
Natural Remedies
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