Cooked black soybeans,
does it really help with Reduced hair loss and reversal of gray hair?
research showsThe grade is ?. No peer-reviewed human trial was identified that fed a defined amount of cooked whole black soybeans and compared objective hair count, density, or gray-hair count. The only directly relevant human report was an uncontrolled series of 10 people applying black-soybean extract to the scalp; animal and cell studies cannot substitute for whole-bean ingestion.
ads claimClaims that black-bean rice or black-bean water prevents hair loss and turns gray hair black are widespread in Korea, but black color and protein content do not establish hair efficacy.
Useful facts when choosing a product
- Black soybean seed coats contain anthocyanin pigments, and soybeans contain protein. These are composition facts.
- Lectins in undercooked legumes are a real cooking hazard and are greatly reduced by thorough cooking.
- A general lectin range for black beans cannot be presented as a measurement of a specific product; no direct product assay was identified here.
- Hair-loss and gray-hair claims for black-bean rice and black-bean water are widely visible in Korean consumer and promotional content.
- Soybeans have ancient documentation, but no chronology was verified for black-seed-coat varieties or hair efficacy.
Chamgap Semantic Classification Code
Candidate index · review held
UNK.cooked-whole-black-soybeans.UNK.hair-loss-and-reversal-of-gray-hair.reduce.UNKUnknown > Cooked whole black soybeans > Unknown > hair loss and reversal of gray hair > Reduction claim > Unknown
An automated migration candidate, not an issued permanent code; exact claim scope remains under review. This machine-generated migration candidate helps retrieval but is not a permanent assignment. The original verdict ID and URL remain authoritative.
What the research actually shows
Direct results from all four searches were screened against the original reports. One directly relevant PubMed human paper was a 10-person uncontrolled topical black-soybean-extract series; it lacked whole-bean oral intake, a control group, and objective gray-hair evaluation. ClinicalTrials.gov returned zero registered trials of cooked whole black soybeans for hair loss or graying. Verdict 431 is C with 40 points for C3G-rich black-soybean seed-coat extract and eye fatigue; verdict 1300 is ? for black sesame or sesamin and hair loss. The former uses an extract for another endpoint, and the latter is a different food.
Why this is classified as ?
No human hair-loss or gray-hair trial feeding cooked whole black soybeans was identified, so the grade is ? with no score. Topical-extract case reports and animal experiments concern different interventions.
Counterpoint. A controlled trial should standardize cooking and intake and use blinded objective hair counts, density, and gray-hair counts.
Rejudgment record. Cross-check applied — Separated oral whole-bean evidence from topical extract reports and animal work across PubMed, ClinicalTrials.gov, and scholarly web searches
Sub-claim grades by effect
This ingredient is marketed for several effects. A single overall grade blends strong and weak claims together, so each effect is graded separately here. The overall grade reflects the strongest disconfirming or core claim.
| Effect (sub-claim) | Grade | Basis |
|---|---|---|
| Eating cooked black soybeans reduces hair loss | ? | No human oral whole-bean trial was identified. |
| Eating cooked black soybeans reverses gray hair | ? | No human trial with an objective gray-hair outcome was identified. |
Cross-check — AI research and Codex final gate
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| PubMed search | Screening for human hair-loss and gray-hair outcomes after oral cooked whole black soybeans | 1 directly relevant human paper screened | Not applicable | Objective hair count, density, and gray-hair count | 1 directly relevant result, 1 excluded, 0 eligible; an uncontrolled 10-person topical-extract series rather than oral whole-bean ingestion | Records queries, search date, directly relevant result count, and exclusion count |
| ClinicalTrials.gov search | Screening registered trials of cooked whole black soybeans for hair loss or graying | 0 search results | Not applicable | Human hair-loss and gray-hair outcomes | 0 results, 0 excluded, 0 eligible | Records registry queries, search date, result count, and exclusion count |
| General scholarly web search | Separating oral whole-bean human trials from topical extract, animal, and cell studies | Total result and exclusion counts were not verified | Not applicable | Objective hair count, density, and gray-hair count | No eligible oral whole-bean human trial was identified; total result and exclusion counts were not verified from the contemporaneous record | Does not invent unverified result or exclusion counts |
Receipt — 3 References
All 3 cited sources were verified for existence at the original page (as of 2026-08-03).
Final verification and publication gate: Codex · Evidence date: 2026-08-03 · Corrections: none
Cite this verdict
[Chamgap] Cooked black soybeans x reduced hair loss and gray-hair reversal — Evidence Grade ?. 3 cited sources checked. Source: https://chamgap.com/en/verdicts/skin-hair/cooked-black-soybeans-hair-loss-gray-hair/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
What this document does and does not do
Chamgap is an information source. It reports what research has and has not confirmed; it does not tell readers what to take or buy. That decision belongs to readers and, when needed, medical or legal professionals. This verdict reflects literature available up to the search date and may change as new research appears. Nothing here is medical advice.