Low-Level Laser Therapy for Androgenetic Alopecia
ABased on 60 studies (7 meta-analyses, 8 RCTs) with 11,100 total participants. 48/60 studies show positive effects.
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A
The Bottom Line
Low-level laser therapy has strong, well-established evidence for supporting hair growth in androgenetic alopecia, backed by multiple meta-analyses and randomized controlled trials.
- 49 out of 58 studies show positive effects, supported by 7 meta-analyses and 8 RCTs
- Stimulates hair follicles through photobiomodulation at specific light wavelengths
- Included in clinical guidelines as an evidence-based option for pattern hair loss
- Available as at-home devices (caps, combs, helmets) and clinical in-office systems
Key Study Findings
Review
A Canadian Consensus on Androgenetic Alopecia: Approach and Management.
Dose: None
vs: Placebo
Effect: None
None
review
The Use of Light-Based Therapies in the Treatment of Alopecia.
Dose: Low-level light therapy (LLLT) various devices and wavelengths; combined with minoxidil or finasteri
vs: Placebo
Effect: LLLT improves hair density in AGA; potential to prolong anagen phase in telogen effluvium; may promo
None
other
n=723
Consensus Recommendations for the Management of Androgenetic Alopecia in Egypt: A Modified Delphi Study.
Dose: None
vs: Placebo
Effect: 27 consensus statements established across 7 areas: diagnosis, minoxidil, antiandrogens, LLLT, adjuv
None
systematic review
Full-Spectrum phototherapy in hair loss management: a systematic review of wavelength-dependent mechanisms, clinical efficacy, and …
Dose: Full-spectrum phototherapy: UVB/UVA, red light, near-infrared (short and long wavelength), mid-infra
vs: Placebo
Effect: UVB/UVA induces T-cell apoptosis (restoring immune privilege in AA); red light activates mitochondri
None
review
The role of microtrauma in hair regrowth and regeneration in non-scarring alopecia.
Dose: Various microtrauma procedures: microneedling, fractional/non-fractional lasers, contact immunothera
vs: Placebo
Effect: Positive outcomes reported for hair density and thickness with microneedling, lasers, LLLT, and PRP
None
randomized controlled trial
n=9
12.5 weeks
Single-blind
Photobiomodulation therapy and 5% minoxidil in female pattern hair loss: a case series focusing on …
Dose: Photobiomodulation therapy (PBMt; red laser 100mW, 4J/point, 25 sessions, twice weekly) + minoxidil
vs: Placebo
Effect: Both groups improved QoL and hair density; PBMt + MIN showed significantly greater reduction in telo
None
Key Statistics
60
Studies
11100
Participants
↑
Positive
A
Grade
Referenced Papers
Dermatology and therapy
2026
The Journal of …
2025
3 citations
Cureus
2025
2 citations
Journal of cutaneous …
2025
2 citations
Lasers in medical …
2025
1 citations
Lasers in medical …
2025
1 citations
Lasers in medical …
2025
1 citations
Journal of cosmetic …
2025
Clinical, cosmetic and …
2025
Italian journal of …
2025
Full-Spectrum phototherapy in hair loss management: a systematic review of wavelength-dependent mechanisms, clinical efficacy, and future directions.
Systematic Review
Lasers in medical …
2025
International journal of …
2024
39 citations
Journal of controlled …
2024
30 citations
Health science reports
2024
14 citations
Journal of clinical …
2024
10 citations
Facial plastic surgery …
2024
8 citations
The impact of monotherapies for male androgenetic alopecia: A network meta-analysis study.
Meta-Analysis
Journal of cosmetic …
2024
8 citations
PloS one
2024
4 citations
Revue medicale suisse
2024
2 citations
Clinical, cosmetic and …
2023
58 citations
American journal of …
2023
41 citations
Journal of cosmetic …
2023
11 citations
International journal of …
2023
10 citations
Journal of cosmetic …
2023
2 citations
Clinics in plastic …
2023
1 citations
Dermatology and therapy
2022
43 citations
The Journal of …
2022
40 citations
Hair regrowth treatment efficacy and resistance in androgenetic alopecia: A systematic review and continuous Bayesian network meta-analysis.
Systematic Review
Frontiers in medicine
2022
14 citations
Lasers in medical …
2022
14 citations
Journal of cutaneous …
2021
44 citations
The Journal of …
2021
31 citations
Annals of dermatology
2021
21 citations
Lasers in surgery …
2021
17 citations
Dermatologic therapy
2021
12 citations
Actas dermo-sifiliograficas
2021
3 citations
Expert opinion on …
2020
147 citations
Expert opinion on …
2020
50 citations
Dermatologic therapy
2020
48 citations
Skin appendage disorders
2020
32 citations
The effectiveness of combination therapies for androgenetic alopecia: A systematic review and meta-analysis.
Meta-Analysis
Dermatologic therapy
2020
30 citations
Low-level laser therapy and narrative review of other treatment modalities in androgenetic alopecia.
Review
Lasers in medical …
2020
17 citations
Factors influencing the effect of photobiomodulation in the treatment of androgenetic alopecia: A systematic review and analyses of summary-level data.
Systematic Review
Dermatologic therapy
2020
7 citations
Dermatologic therapy
2019
124 citations
Lasers in medical …
2019
88 citations
Clinical, cosmetic and …
2019
41 citations
Lasers in surgery …
2019
21 citations
Acta dermatovenerologica Alpina, …
2019
7 citations
The Journal of …
2019
6 citations
Efficacy of non-surgical treatments for androgenetic alopecia: a systematic review and network meta-analysis.
Meta-Analysis
Journal of the …
2018
80 citations
Lasers in medical …
2018
75 citations
The Journal of …
2018
69 citations
Use of low-level laser therapy in treatment of the androgenic alopecia, the first systematic review.
Systematic Review
Journal of cosmetic …
2018
13 citations
Actas dermo-sifiliograficas
2018
9 citations
The effectiveness of treatments for androgenetic alopecia: A systematic review and meta-analysis.
Meta-Analysis
Journal of the …
2017
343 citations
Low-level laser therapy as a treatment for androgenetic alopecia.
Systematic Review
Lasers in surgery …
2017
71 citations
Dermatologic surgery : …
2017
43 citations
A Critical Assessment of the Evidence for Low-Level Laser Therapy in the Treatment of Hair Loss.
Review
Dermatologic surgery : …
2017
39 citations
Actas dermo-sifiliograficas
2017
17 citations
Revue medicale de …
2017
Interventions for female pattern hair loss.
Meta-Analysis
The Cochrane database …
2016
18 citations
Lasers in surgery …
2014
243 citations
Lasers in surgery …
2014
104 citations
International journal of …
2014
63 citations
Lasers in surgery …
2013
140 citations
Facial plastic surgery …
2013
16 citations
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Commonly Used Dosages
- hairloss:
- 8-15 minutes, 3x/week
Upper limit: Not applicable
Dosages Studied in Research
| Dosage | Duration | Effect | N |
|---|---|---|---|
| None | -- | Positive | -- |
| Low-level light therapy (LLLT) various devices and wavelengths; combined with minoxidil or finasteri | -- | Positive | -- |
| None | -- | Neutral | 723 |
| Full-spectrum phototherapy: UVB/UVA, red light, near-infrared (short and long wavelength), mid-infra | -- | Positive | -- |
| Various microtrauma procedures: microneedling, fractional/non-fractional lasers, contact immunothera | -- | Positive | -- |
| Photobiomodulation therapy (PBMt; red laser 100mW, 4J/point, 25 sessions, twice weekly) + minoxidil | 12.5 weeks | Positive | 9 |
| Low-level laser therapy (LLLT) combined with topical minoxidil vs topical minoxidil alone | -- | Positive | -- |
| None | -- | Positive | -- |
Best taken: Use device for recommended duration 3 times per week on non-consecutive days
Safety & Side Effects
Reported Side Effects
- ⚠ Mild scalp warmth or tingling
- ⚠ Headache (uncommon)
- ⚠ Initial shedding phase (rare)
- ⚠ Dry scalp
Known Interactions
- ● Photosensitizing medications (tetracyclines, fluoroquinolones) may increase scalp sensitivity
- ● No significant interactions with oral hair loss medications
Tolerable upper intake: Not applicable
Always consult your healthcare provider before starting any supplement.
Frequently Asked Questions
Does Low-Level Laser Therapy help with Androgenetic Alopecia?
Based on 60 studies with 11,100 participants, there is strong evidence from multiple clinical trials that Low-Level Laser Therapy may support Androgenetic Alopecia management. Our evidence grade is A (Strong Evidence).
How much Low-Level Laser Therapy should I take for Androgenetic Alopecia?
Studies have used various dosages. A commonly studied range is 8-15 minutes, 3x/week. Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of Low-Level Laser Therapy?
Reported side effects may include Mild scalp warmth or tingling, Headache (uncommon), Initial shedding phase (rare), Dry scalp. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
How strong is the evidence for Low-Level Laser Therapy and Androgenetic Alopecia?
We rate the evidence as Grade A (Strong Evidence). This rating is based on 60 peer-reviewed studies with 11,100 total participants. The overall direction of effect is positive.
Related Evidence
Other ingredients for Androgenetic Alopecia
Low-Level Laser Therapy for other conditions
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.