NutriStack
Symptom·Appearance·Reviewed May 30, 2026
Supplements for Dull, brittle hair.
When dull, brittle hair is the complaint, these are the supplements most often associated with it in the NutriStack library, ranked by how directly each one targets it and by the strength of the evidence.
Ranked by relevance, top first.
Relevance reflects how directly each supplement targets this symptom in the NutriStack map. Evidence is the supplement’s own rating. Open any name for the full profile.
- 01IronStrong85% match
Low iron and ferritin are a common reversible driver of hair shedding and poor hair quality, especially in menstruating women.
SuggestedIron bisglycinate - 02Vitamin D3Moderate72% match
Vitamin D receptors are involved in the hair follicle cycle, and low status has been linked to shedding in observational studies.
SuggestedD3 (cholecalciferol) - 03ZincModerate68% match
Zinc supports protein synthesis and follicle function, and frank deficiency can cause brittle hair and shedding.
SuggestedZinc picolinate - 04Collagen PeptidesLimited62% match
Collagen peptides supply amino acids used in the hair shaft and may support hair quality, though marketing claims currently outpace the evidence.
SuggestedHydrolyzed collagen peptides - 05Fish OilLimited58% match
Omega-3 fatty acids support the scalp and follicle environment and may improve hair density or shine, based on small studies.
SuggestedHigh-EPA/DHA fish oil - 06Vitamin B7Limited54% match
Biotin is a cofactor for keratin production, but supplementation only reliably helps the small minority who are genuinely biotin deficient.
SuggestedBiotin (D-biotin)
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These rankings come from the same library that powers the NutriStack app. Open any supplement for full dosing, forms, interactions, and citations.