Conditions

16 health conditions with evidence-based supplement research

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

Each condition page ranks supplement ingredients by the strength of clinical evidence. Here is what each grade means:

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.

Age-Related Hair Thinning

Near-universal over age 60

Gradual density reduction Finer hair texture Slower growth rate

Alopecia Areata

2% lifetime risk

Circular bald patches Exclamation point hairs Nail pitting

Androgenetic Alopecia

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

Receding hairline Crown thinning Widening part +1

Brittle Hair and Nails Syndrome

Affects approximately 20% of the general population

Dry, splitting hair Increased breakage Brittle, peeling nails +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

Female Pattern Hair Loss

40% of women by age 50

Widening central part Diffuse crown thinning Preserved frontal hairline

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

Iron Deficiency Hair Loss

Affects up to 60% of premenopausal women with hair loss

Diffuse thinning Increased shedding Fatigue +1

Nutritional Deficiency Hair Loss

Common in restrictive diets and malabsorption conditions

Diffuse thinning Dry dull hair Slow growth +1

Postpartum Hair Loss

Affects 40-50% of women postpartum

Excessive shedding Thinning around temples Reduced hair density

Scalp Inflammation (Folliculitis & Dermatitis)

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

Scalp redness Itching and flaking Pustules around follicles +1

Scalp Psoriasis Hair Loss

45-56% of psoriasis patients have scalp involvement

Thick scales Red patches Itching +1

Stress-Related Hair Loss

Increasingly common; associated with telogen effluvium

Diffuse shedding Hair thinning Slower regrowth

Telogen Effluvium

Second most common cause of hair loss

Diffuse thinning Excessive shedding Reduced ponytail volume

Thyroid-Related Hair Loss

4-10% of general population has thyroid dysfunction

Diffuse thinning Dry brittle hair Loss of outer eyebrows

Traction Alopecia

Common in certain hairstyle practices

Hairline recession Broken hairs Folliculitis

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.