ケラチン：加齢性薄毛

合計495名の参加者を対象とした32件の研究（RCT 5件を含む）に基づく。32件中21件の研究で肯定的な効果が示されている。

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結論

Keratin supplements show good evidence for supporting hair growth in age-related thinning, with multiple RCTs reporting positive results, though the research includes a mix of direct and indirect evidence.

21 out of 32 studies show positive effects, including 5 randomized controlled trials
Annurca apple-derived keratin formulations have shown particularly promising results in RCTs
Keratin-related signaling pathways are well-established as important for hair follicle health
Some evidence is from laboratory studies, so real-world effectiveness may vary

Key Study Findings

Other

TBG096 stimulates hair regeneration through IGF-1R-mediated angiogenesis.

Dose: None vs: untreated controls Outcome: hair follicle transition from telogen to anagen phase 効果: None None

対象集団: female and male rats, naturally aged and DHT-induced alopecia model mice

in vitro/ex vivo study

A proprietary lipidosterolic extract of Serenoa repens promotes hair growth through mechanisms that extend beyond …

Dose: USPlus DERM (lipidosterolic extract of Serenoa repens) at 0.4 and 10 μg/mL in hair follicle organ cu vs: Placebo 効果: USPlus DERM IC50=0.39 μg/mL (vs 29.1 μg/mL standard extract); 0.4 μg/mL significantly reduced melani None

Animal/Laboratory Study

IKZF1 and Ikaros Overexpression Results in Alopecia Areata-Like Phenotype in Mice.

Dose: Corticosteroid injections (dose not specified) in transgenic mice vs: Placebo 効果: None None

Observational Study n=144 Open-label

Alternative and Complimentary Medication Use in Singers: A Pilot Survey.

Dose: None vs: None Outcome: Self-reported use patterns and perceived vocal effects 効果: None None

対象集団: Singers with varying singing styles, mean age 51.8y

Review

B-vitamins and one-carbon metabolism during pregnancy: health impacts and challenges.

Dose: None vs: None Outcome: Pregnancy outcomes and offspring neurodevelopment 効果: None None

対象集団: Pregnant women (review)

Review

Cannabidiol (CBD) as an emerging nutraceutical ingredient from industrial hemp: regulation, production, extraction, nutraceutical properties, …

Dose: None vs: None Outcome: CBD food applications and functional properties 効果: None None

対象集団: General population (review of CBD in food industry)

Key Statistics

研究数

6199

参加者数

↔

Mixed

グレード

Referenced Papers

TBG096 stimulates hair regeneration through IGF-1R-mediated angiogenesis. Other

Biochemical pharmacology 2026

Cannabidiol (CBD) as an emerging nutraceutical ingredient from industrial hemp: regulation, production, extraction, nutraceutical properties, and functionality. Review

Critical reviews in … 2025 5 件の引用

B-vitamins and one-carbon metabolism during pregnancy: health impacts and challenges. Review

The Proceedings of … 2025 5 件の引用

Alternative and Complimentary Medication Use in Singers: A Pilot Survey. Other

Journal of voice … 2025 2 件の引用

IKZF1 and Ikaros Overexpression Results in Alopecia Areata-Like Phenotype in Mice. Other

Experimental dermatology 2025 2 件の引用

A proprietary lipidosterolic extract of Serenoa repens promotes hair growth through mechanisms that extend beyond 5-alpha reductase inhibition: Insights from … Other

International journal of … 2025 1 件の引用

Tolerability of long-term cannabidiol supplementation to healthy adult dogs. RCT

Journal of veterinary … 2024 19 件の引用

Effects of vitamins and polyunsaturated fatty acids on cognitive function in older adults with mild cognitive impairment: a meta-analysis of … Meta-Analysis

European journal of … 2024 16 件の引用

Safety study of cannabidiol products in healthy dogs. Other

Frontiers in veterinary … 2024 11 件の引用

Dietary Clostridium butyricum and 25-Hydroxyvitamin D3 modulate bone metabolism of broilers through the gut-brain axis. Other

Poultry science 2024 9 件の引用

Does Vitamin B6 Act as an Exercise Mimetic in Skeletal Muscle? Review

International journal of … 2024 5 件の引用

Does a broad-spectrum cannabidiol supplement improve performance in a 10-min cycle ergometer performance-test? RCT

European journal of … 2024 4 件の引用

Prevalence of Dietary Modification and Supplement Use in Patients with Metastatic Renal Cell Carcinoma Receiving Systemic Therapy. Other

Nutrients 2024 2 件の引用

Cannabidiol can affect morphology, morphometry, enzymatic and microbial activity of rabbit digestive system. Other

Journal of animal … 2024

The Role of One-Carbon Metabolism in Healthy Brain Aging. Review

Nutrients 2023 9 件の引用

Reply to "Vitamin D status in scarring and nonscarring alopecia". Other

Journal of the … 2022 6 件の引用

Acceptability of cannabidiol in patients with psychosis. Other

Therapeutic advances in … 2022 4 件の引用

Role of vitamin D in hair loss: A short review. Review

Journal of cosmetic … 2021 44 件の引用

Feeding Cannabidiol (CBD)-Containing Treats Did Not Affect Canine Daily Voluntary Activity. Other

Frontiers in veterinary … 2021 26 件の引用

Nutrient intakes from supplement and factors associated with supplement use among breast cancer survivors: A cross-sectional study. Other

European journal of … 2021 5 件の引用

Topical L-thyroxine: The Cinderella among hormones waiting to dance on the floor of dermatological therapy? Review

Experimental dermatology 2020 10 件の引用

Vitamin D Receptor Gene Polymorphisms Taq-1 and Cdx-1 in Female Pattern Hair Loss. Other

Indian journal of … 2020 5 件の引用

Hepatotoxicity of a Cannabidiol-Rich Cannabis Extract in the Mouse Model. Other

Molecules (Basel, Switzerland) 2019 137 件の引用

Decarbonylation: A metabolic pathway of cannabidiol in humans. Other

Drug testing and … 2019 31 件の引用

Folic acid supplement use and breast cancer risk in BRCA1 and BRCA2 mutation carriers: a case-control study. Other

Breast cancer research … 2019 25 件の引用

Vitamin D Receptor Gene Polymorphism In Chronic Telogen Effluvium; A Case-Control Study. Other

Clinical, cosmetic and … 2019 7 件の引用

Comparative evaluation between two nutritional supplements in the improvement of telogen effluvium. Other

Clinical, cosmetic and … 2018 16 件の引用

Vitamin D Level in Alopecia Areata. Other

Indian journal of … 2017 46 件の引用

Correspondence of folate dietary intake and biomarker data. Other

The American journal … 2017 34 件の引用

Zinc and skin biology. Review

Archives of biochemistry … 2016 124 件の引用

Assessment of vitamin D receptors in alopecia areata and androgenetic alopecia. Other

Journal of cosmetic … 2016 43 件の引用

[Folate metabolism--epigenetic role of choline and vitamin B12 during pregnancy]. Review

Ginekologia polska 2015 7 件の引用

Folic acid supplementation with and without vitamin B6 and revascularization risk: a meta-analysis of randomized controlled trials. Meta-Analysis

Clinical nutrition (Edinburgh, … 2014 12 件の引用

Effect of folate supplementation on folate status and health outcomes in infants, children and adolescents: a systematic review. Systematic Review

International journal of … 2012 19 件の引用

Inhibition of inflammatory gene expression in keratinocytes using a composition containing carnitine, thioctic Acid and saw palmetto extract. Other

Evidence-based complementary and … 2011 27 件の引用

[Vitamin B6 (Pyridoxine)--excessive dosage in food supplements and OTC medications]. Review

Harefuah 2004

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

一般的な使用量

hairloss:: 500 mg/day

上限量： Not established

研究で検討された用量

用量	期間	効果	N
None	--	Positive	--
USPlus DERM (lipidosterolic extract of Serenoa repens) at 0.4 and 10 μg/mL in hair follicle organ cu	--	Positive	--
Corticosteroid injections (dose not specified) in transgenic mice	--	Positive	--
None	--	Neutral	144
None	--	Positive	--
None	--	Positive	--
None	--	Neutral	--
5 or 10 mg/kg BW/day	36 weeks	Neutral	18

推奨摂取タイミング： With meals for better absorption

Safety & Side Effects

報告されている副作用

⚠ Generally well tolerated
⚠ Mild gastrointestinal discomfort in some individuals
⚠ Rare allergic reactions

既知の相互作用

● No significant drug interactions established
● May interact with protein absorption in individuals with digestive disorders

耐容上限摂取量： Not established

サプリメントの摂取を開始する前に、必ず医療専門家にご相談ください。

Frequently Asked Questions

Does ケラチン help with 加齢性薄毛?

Based on 36 studies with 6,199 participants, there is strong evidence from multiple clinical trials that ケラチン may support 加齢性薄毛 management. Our evidence grade is A (Strong Evidence).

How much ケラチン should I take for 加齢性薄毛?

Studies have used various dosages. A commonly studied range is 500 mg/day. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of ケラチン?

Reported side effects may include Generally well tolerated, Mild gastrointestinal discomfort in some individuals, Rare allergic reactions. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

How strong is the evidence for ケラチン and 加齢性薄毛?

We rate the evidence as Grade A (Strong Evidence). This rating is based on 36 peer-reviewed studies with 6,199 total participants. The overall direction of effect is mixed.

Related Evidence

に関する他の成分：加齢性薄毛

ビビスカル A コラーゲン A MSM B Vitamin E D スギナエキス D Copper Peptides (GHK-Cu) D

ケラチン他の症状・状態について

休止期脱毛症 B

総合評価

合計495名の参加者を対象とした32件の研究（RCT 5件を含む）に基づく。32件中21件の研究で肯定的な効果が示されている。

Evidence Strength92%

High confidence

研究の内訳

RCT (2)Meta (2)Other (32)

代替成分との比較

この症状に対する他の成分との比較をご覧ください。

に関するすべての成分を見る：加齢性薄毛

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FDAに関する免責事項: これらの記述は米国食品医薬品局（FDA）による評価を受けていません。本ウェブサイトの製品および情報は、疾病の診断、治療、治癒、または予防を目的としたものではありません。表示されているエビデンスグレードは、公開された査読済み研究の分析に基づいており、医療上の助言を構成するものではありません。サプリメントの摂取を開始する前に、必ず医療専門家にご相談ください。