# HairCited

> Evidence-based hair supplement reviews. Every claim about biotin, iron, zinc, saw palmetto, and hair supplements backed by peer-reviewed research from PubMed.

## Data Scope
- Hair health ingredients: biotin, iron, zinc, saw palmetto, vitamin D, collagen, viviscal
- Hair conditions: hair loss, alopecia, thinning hair, brittle nails
- Site-scoped evidence reviews linking ingredients to hair conditions
- Interactive tools: biotin dosage calculator, hair supplement quiz, interaction checker, stack builder
- Evidence grades: A (Strong — multiple RCTs/meta-analyses), B (Good — at least one RCT), C (Some — small studies), D (Preliminary — in vitro/pilot), F (Negative — <30% positive)
- Data sources: PubMed / MEDLINE (NLM), PubMed Central (PMC) full-text (CC-BY), Semantic Scholar (Allen AI), ClinicalTrials.gov
- Languages: 15 (en + ja, ko, zh-hans, de, fr, es, pt, it, ru, tr, ar, hi, vi, id)

## URL Patterns
- Append `.md` to any URL for plain-text markdown format.
- i18n: URL prefix `/{lang}` for non-English (ja, ko, zh-hans, de, fr, es, pt, it, ru, tr, ar, hi, vi, id).
- `/` — Homepage — ingredient grid (e.g. `/`)
- `/ingredients/` — All ingredients (site-scoped) (e.g. `/ingredients/`)
- `/ingredients/{slug}/` — Ingredient detail (e.g. `/ingredients/ashwagandha/`)
- `/ingredients/{slug}/conditions/` — Ingredient evidence links (e.g. `/ingredients/ashwagandha/conditions/`)
- `/ingredients/category/{cat}/` — Ingredients by category (e.g. `/ingredients/category/herb/`)
- `/conditions/` — All conditions (site-scoped) (e.g. `/conditions/`)
- `/conditions/{slug}/` — Condition detail (e.g. `/conditions/age-related-thinning/`)
- `/conditions/{slug}/ingredients/` — Condition evidence links (e.g. `/conditions/age-related-thinning/ingredients/`)
- `/evidence/{ingredient}/for/{condition}/` — Evidence detail (N-squared) (e.g. `/evidence/biotin/for/nutritional-deficiency-hair-loss/`)
- `/papers/` — Research papers index (e.g. `/papers/`)
- `/papers/{pmid}/` — Research paper detail (PubMed) (e.g. `/papers/11310286/`)
- `/compare/` — Ingredient comparison index (e.g. `/compare/`)
- `/compare/{slug1}-vs-{slug2}/` — Compare two ingredients (e.g. `/compare/dutasteride-vs-finasteride/`)
- `/tools/` — Interactive supplement tools (e.g. `/tools/`)
- `/tools/{slug}/` — Tool page (e.g. `/tools/biotin-dosage-calculator/`)
- `/guides/` — Educational guides index (e.g. `/guides/`)
- `/guides/{slug}/` — Guide detail (e.g. `/guides/aging-hair-thinning-supplements/`)
- `/guides/category/{cat}/` — Guides by category (e.g. `/guides/category/lifestyle/`)
- `/glossary/` — Glossary terms index (e.g. `/glossary/`)
- `/glossary/{slug}/` — Glossary term detail (e.g. `/glossary/5-alpha-reductase/`)
- `/glossary/category/{cat}/` — Glossary by category (e.g. `/glossary/category/mechanism/`)
- `/search/?q={query}` — Full-page search (noindex) (e.g. `/search/?q=vitamin`)
- `/developers/` — Developer documentation + API (e.g. `/developers/`)
- `/api/openapi.json` — OpenAPI 3.1 spec (JSON) (e.g. `/api/openapi.json`)
- `/figures/` — Paper figure gallery (e.g. `/figures/`)
- `/faq/` — Frequently asked questions (e.g. `/faq/`)
- `/methodology/` — Evidence grading methodology (e.g. `/methodology/`)
- `/editorial-policy/` — Editorial policy (e.g. `/editorial-policy/`)
- `/medical-disclaimer/` — Medical disclaimer (e.g. `/medical-disclaimer/`)
- `/feed/papers/` — RSS — latest papers (e.g. `/feed/papers/`)
- `/feed/evidence/` — RSS — recent evidence updates (e.g. `/feed/evidence/`)

## Browse
- [All Ingredients](https://haircited.com/ingredients/)
- [All Conditions](https://haircited.com/conditions/)
- [Research Papers](https://haircited.com/papers/)
- [Compare Ingredients](https://haircited.com/compare/)

## Interactive Tools
- [All Tools](https://haircited.com/tools/)

## Learn
- [Educational Guides](https://haircited.com/guides/)
- [Glossary](https://haircited.com/glossary/)
- [FAQ](https://haircited.com/faq/)

## Research
- [Papers by Study Type](https://haircited.com/papers/)
- [Figures Gallery](https://haircited.com/figures/)
- [Evidence Grading Methodology](https://haircited.com/methodology/)

## Developer Resources
- [REST API Documentation](https://haircited.com/developers/)
- [OpenAPI 3.1 Spec](https://haircited.com/api/openapi.json)
- [RSS Feeds](https://haircited.com/feed/papers/)

## REST API

Free REST API. No authentication required. JSON responses. CORS enabled. Site-scoped: returns data for the current domain only.

| Method | Endpoint | Description |
|--------|----------|-------------|
| GET | `/api/ingredients/` | List ingredients (site-scoped, ?q=, ?category=) |
| GET | `/api/ingredients/{slug}/` | Ingredient detail |
| GET | `/api/conditions/` | List conditions (site-scoped, ?q=) |
| GET | `/api/conditions/{slug}/` | Condition detail |
| GET | `/api/evidence/` | List evidence links (?ingredient=, ?condition=) |
| GET | `/api/evidence/{pk}/` | Evidence link detail |
| GET | `/api/papers/` | List papers (site-scoped via EvidenceLink, ?q=, ?year=) |
| GET | `/api/papers/{pmid}/` | Paper detail (has_full_text, total_sections) |
| GET | `/api/figures/` | List paper figures (?pmid=, ?figure_type=, ?has_description=) |
| GET | `/api/figures/{pk}/` | Figure detail |
| GET | `/api/paper-sections/` | List paper sections (?pmid=) |
| GET | `/api/paper-sections/{pk}/` | Section detail |
| GET | `/api/paper-tables/` | List paper tables (?pmid=) |
| GET | `/api/paper-tables/{pk}/` | Table detail |
| GET | `/api/glossary/` | List glossary terms (site-scoped) |
| GET | `/api/glossary/{slug}/` | Glossary term detail |
| GET | `/api/guides/` | List guides (site-scoped) |
| GET | `/api/guides/{slug}/` | Guide detail |
| GET | `/api/search/?q={query}` | Unified search (6 entity types, site-scoped) |

```bash
curl -s "https://haircited.com/api/ingredients/"
```

[API Docs](https://haircited.com/developers/) · [OpenAPI Spec](https://haircited.com/api/openapi.json)

## Developer Tools
- **PyPI**: `pip install citedhealth` — [citedhealth](https://pypi.org/project/citedhealth/) — Sync/async Python client for CITED Health REST API (httpx)
- **npm**: `npm install citedhealth` — [citedhealth](https://www.npmjs.com/package/citedhealth) — TypeScript client (ESM+CJS, zero deps)
- **pkg.go.dev**: `go get github.com/citedhealth/citedhealth-go` — [citedhealth-go](https://pkg.go.dev/github.com/citedhealth/citedhealth-go) — Go client (stdlib only, zero deps)
- **crates.io**: `cargo add citedhealth` — [citedhealth](https://crates.io/crates/citedhealth) — Async Rust client (reqwest/serde/tokio)
- **rubygems.org**: `gem install citedhealth` — [citedhealth](https://rubygems.org/gems/citedhealth) — Ruby client (stdlib only, zero deps)
- **PyPI**: `uvx citedhealth-mcp` — [citedhealth-mcp](https://pypi.org/project/citedhealth-mcp/) — MCP server for Claude/Cursor/Windsurf
- **Embed Widget**: [haircited-embed](https://widget.haircited.com)

## CITED Health

Part of [Cited Health](https://citedhealth.com) developer tools ecosystem.
- [Cited Health](https://citedhealth.com) — Evidence-based supplement research network hub
- [SleepCited](https://sleepcited.com) — Sleep supplement evidence: melatonin, magnesium, valerian
- [GutCited](https://gutcited.com) — Gut health supplement evidence: probiotics, prebiotics
- [ImmuneCited](https://immunecited.com) — Immune supplement evidence: vitamin C, zinc, elderberry
- [BrainCited](https://braincited.com) — Brain supplement evidence: omega-3, bacopa, lion's mane
- [WeightCited](https://weightcited.com) — Weight management supplement evidence: green tea, CLA, berberine
- [HeartCited](https://heartcited.com) — Heart supplement evidence: omega-3, CoQ10, magnesium
- [SkinCited](https://skincited.com) — Skin supplement evidence: collagen, vitamin C, niacinamide

## Images (CDN)

OG images at https://cdn.haircited.com/og/{type}/{slug}.png
- https://cdn.haircited.com/og/homepage.png

## Full Index
- [Full content index](https://haircited.com/llms-full.txt)
- [XML Sitemap](https://haircited.com/sitemap.xml)