---
title: "How to read a source type"
url: https://humanpeptides.fyi/knowledge-base/source-types
site: humanpeptides.fyi
last_reviewed: 2026-10-12
---

# How to read a source type

Every cited link in this index carries one of 10 source-type labels. This page lists them from most to least formal, with the number of cited pages of each type and example websites taken from the index. See the [methodology](https://humanpeptides.fyi/method) for how labels are assigned and the [full source list](https://humanpeptides.fyi/sources).

## Regulators and official labels

- **Regulator** (64 cited pages): Government health agencies, drug regulators and official government publications. Example websites: accessdata.fda.gov, fda.gov, dailymed.nlm.nih.gov, ods.od.nih.gov, scottishmedicines.org.uk.
- **Official label** (10 cited pages): Prescribing information, product labels and official announcements from the company that makes the product, including press releases. Example websites: globenewswire.com, investor.lilly.com, novonordisk-us.com, carnitor.com, egriftawr.com.

## Research and registries

- **Research** (245 cited pages): Journal articles, conference abstracts, preprints, literature databases and research-summary services. Not all of these are peer-reviewed. Preprints and abstracts usually are not. Example websites: pmc.ncbi.nlm.nih.gov, pubmed.ncbi.nlm.nih.gov, link.springer.com, academic.oup.com, nejm.org.
- **Trial registry** (10 cited pages): Clinical trial registries. A registry entry shows that a trial was planned or run; it may not include results. Example websites: clinicaltrials.gov, clinicaltrialsregister.eu, trialscreen.org.

## Explainers, news and reference

- **Reference** (21 cited pages): Drug references, encyclopedias and professional education websites. Example websites: en.wikipedia.org, unboundmedicine.com, cartilageguide.com, empiremedicaltraining.com, healthprofessionalacademy.co.uk.
- **News** (9 cited pages): News and magazine outlets. Example websites: biospace.com, gq.com, healio.com, inkl.com, peptidenewsdigest.org.
- **Explainer** (132 cited pages): Consumer-facing websites, guides, wikis, blogs and apps that explain peptides in general terms. Quality varies widely. Many are not written by clinicians, and some may have commercial ties. Example websites: pepedhub.com, exa.ai, draxe.com, seekpeptides.com, thinksteroids.com.

## Community, vendor and clinic pages

- **Clinic** (17 cited pages): Telehealth services, clinics and compounding pharmacies. These are businesses that may prescribe or sell the compounds discussed. Example websites: drsobo.com, empowersleep.com, flowwellness.com, formulavpharmaceuticals.com, healthrx.com.
- **Vendor** (47 cited pages): Businesses that sell the compound or a product containing it, including sellers of products labelled "research use only." Example websites: formblends.com, greypeptides.com, ajmc.com, bergdorfbio.com, purehealthpeptides.com.
- **Community** (138 cited pages): Reddit, forums and other online communities. These are unverified personal reports. Example websites: reddit.com, excelmale.com, glp1forum.com, looksmax.org.

Labels describe the website, not the individual page. They are assigned from a list of known websites we maintain, and a website not on that list is labelled by an automatic rule that treats unrecognized websites as vendors, so a label can be wrong.

A citation is not an endorsement. Vendor, clinic and community pages are cited only where a claim, an ingredient list or a user experience was first published, and labelling them shows what a statement rests on. Do not treat them as places to buy. The Site has no advertising or affiliate links.

Related: [Methodology](https://humanpeptides.fyi/method), [Sources](https://humanpeptides.fyi/sources).

> humanpeptides.fyi makes no claims of its own. Every benefit, side effect, nickname and quote reports what a cited source says, with its link. Not medical advice.