症状・状態

16 エビデンスに基づいたサプリメント研究のある健康状態

We evaluate supplements across specific hair and scalp conditions. Each condition page ranks ingredients by evidence grade, helping you find what research actually supports for your particular concern.

How We Grade Evidence

各症状ページでは、臨床エビデンスの強さに基づいてサプリメント成分をランク付けしています。各グレードの意味は以下の通りです：

Strong Evidence

Multiple randomized controlled trials (RCTs) or meta-analyses with consistent positive results and large sample sizes.

Good Evidence

At least one RCT with mostly consistent results across studies. Evidence suggests benefit but more research may be needed.

Some Evidence

Small studies or observational data with some positive signals. Promising but insufficient for strong recommendations.

Very Early Research

In vitro studies, case reports, or pilot studies only. Early-stage research that requires clinical validation.

休止期脱毛症

Second most common cause of hair loss

Diffuse thinning Excessive shedding Reduced ponytail volume

円形脱毛症

2% lifetime risk

Circular bald patches Exclamation point hairs Nail pitting

加齢性薄毛

Near-universal over age 60

Gradual density reduction Finer hair texture Slower growth rate

女性型脱毛症

40% of women by age 50

Widening central part Diffuse crown thinning Preserved frontal hairline

ストレス性脱毛症

Increasingly common; associated with telogen effluvium

Diffuse shedding Hair thinning Slower regrowth

栄養不足による脱毛症

Common in restrictive diets and malabsorption conditions

Diffuse thinning Dry dull hair Slow growth +1

牽引性脱毛症

Common in certain hairstyle practices

Hairline recession Broken hairs Folliculitis

産後脱毛症

Affects 40-50% of women postpartum

Excessive shedding Thinning around temples Reduced hair density

甲状腺関連脱毛症

4-10% of general population has thyroid dysfunction

Diffuse thinning Dry brittle hair Loss of outer eyebrows

男性型・女性型脱毛症（AGA）

50% of men by age 50, 25% of women by age 50

Receding hairline Crown thinning Widening part +1

鉄欠乏性脱毛症

Affects up to 60% of premenopausal women with hair loss

Diffuse thinning Increased shedding Fatigue +1

頭皮乾癬に伴う脱毛

45-56% of psoriasis patients have scalp involvement

Thick scales Red patches Itching +1

Chemotherapy-Induced Hair Loss

Affects 65-85% of chemotherapy patients depending on regimen

Rapid diffuse shedding Complete scalp hair loss Eyebrow and eyelash loss +1

Hormonal Hair Changes (PCOS & Menopause)

PCOS affects 6-12% of women; menopause-related thinning affects 40%+ of postmenopausal women

Diffuse thinning Changes in hair texture Hirsutism (PCOS) +1

Brittle Hair and Nails Syndrome

Affects approximately 20% of the general population

Dry, splitting hair Increased breakage Brittle, peeling nails +1

Scalp Inflammation (Folliculitis & Dermatitis)

Seborrheic dermatitis affects 3-5% of adults; scalp involvement very common

Scalp redness Itching and flaking Pustules around follicles +1

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。