There's a specific gap in peptide information online: between academic databases (UniProt, PDB, Peptipedia) that require a biochemistry degree to navigate, and vendor product pages that are optimized for conversions rather than data accuracy. For a practitioner, researcher, or evidence-led self-experimenter, there has been no single trustworthy reference with clinical-grade data density and vendor-neutral framing.
The Next Pep research library at /library sits in that gap. 60+ compounds — BPC-157, TB-500, Tirzepatide, Semaglutide, Ipamorelin, CJC-1295, Sermorelin, GHK-Cu, PT-141, Epitalon, MOTS-c, NAD+, Semax, Selank, Thymosin Alpha-1, and dozens more — each with molecular data, mechanism, pharmacokinetics, dosing protocols, safety profile, and primary PubMed sources in one view. Free. No signup. No vendor sponsorship.
Key Takeaways
- —Academic peptide databases (UniProt, Peptipedia, PDB) contain >19,000 peptides but require specialised tooling to interpret; vendor pages contain commercial framing, not research-grade data.
- —The Next Pep library covers 60+ practitioner-relevant compounds with the same schema for each: molecular formula, CAS, MW, sequence, mechanism, PK, dosing protocols, safety, and PubMed links.
- —Data is sourced from primary literature and cross-referenced against PubChem and PubMed — no vendor marketing copy enters the library.
- —Paste any vendor product URL to import a new peptide in 20–40 seconds — our extractor pulls structured data from unstructured vendor pages automatically.
- —Free, browser-based, no signup, maintained by a researcher (not a vendor).
Three typical sources of peptide information, and why each is problematic:
The first result for "BPC-157" on Google is usually a vendor product page. These are optimised for purchase conversion, not research comprehension. They typically include:
What they typically don't include at sufficient data density: the CAS number, the full amino acid sequence, species-specific half-life data, published trial citations, or explicit separation of preclinical vs human evidence. Vendor descriptions are a fine entry point but not a reference-grade source.
UniProt, PubChem, Protein Data Bank, Peptipedia — these are the ground-truth sources. They contain the data. They also assume a specific user profile: a researcher who can translate a FASTA sequence into a mechanistic interpretation, who already knows which journals and study types matter for a given claim, and who has institutional access to paywalled primary literature.
For a practitioner evaluating whether BPC-157 is appropriate for a specific use case, UniProt's entry P98171 (BPC — the gastric juice protein precursor) is useful only after you already know what you're looking at. It's a reference tier, not a decision-support layer.
Reddit, Discord, Instagram, and various wellness forums have large, active peptide communities. The practical wisdom in these communities is real — practitioners share dosing experiences, side effect reports, vendor comparisons. But the epistemic problems are obvious: nothing is citation-backed, individual reports don't aggregate to population-level insight, and the most confident claims are often the least evidence-based.
The gap this leaves: a clinical-grade, practitioner-oriented reference with citations, structured data, and vendor-neutral framing. That's what the Next Pep library is built for.
Every entry in a research-useful peptide database should include these fields. If any are missing, the database is closer to a product catalogue than a reference.
Identifier fields:
Mechanism fields:
Pharmacology fields:
Evidence fields:
Practical fields:
The Next Pep library populates all of these fields for its 60+ compounds. Where a field is unknown or unestablished, it's marked as such — not invented to look complete.
Browse the full library at /library. A few things that distinguish it from the alternatives:
Every peptide page follows the same template: identifier → mechanism → PK → evidence → dosing → safety → regulatory. This consistency is what makes cross-peptide comparison possible (and what powers the comparison tool at /compare).
Every mechanism claim, every dosing protocol, every adverse event statement is traceable to a source. Inline markdown citations link directly to PubMed, PubChem, or the primary journal. Not a vendor citation. Not a Reddit post.
If you're researching a peptide not yet in the library — a newly synthesised compound, a niche research tool, something you found on a vendor page — paste the vendor URL into the search bar. Our extractor pulls structured data from the vendor page in 20–40 seconds:
This is unique. No other peptide research platform ingests arbitrary vendor URLs. It's particularly useful for obscure peptides where the only accessible documentation is on a specific vendor's page.
The library is editorially independent. Vendors don't pay for placement. We don't rank compounds based on affiliate payouts. The comparison display order is deterministic (by selection order, not by commercial interest). You can trust that the compound ordering you see is the compound ordering you selected.
Every compound in the library is built from three data sources in priority order:
Vendor product pages are used only for the URL-import workflow — they populate into a separate "vendor data" layer that is explicitly excluded from the comparison and primary display. Vendor copy never mixes into the mechanism or dosing fields.
UniProt and PubChem are canonical reference databases for protein and chemical data — they're the ground truth. Next Pep layers practitioner-relevant data (dosing protocols, clinical evidence summaries, safety profiles, regulatory status) on top of that canonical data. Think of us as the decision-support layer for researchers and practitioners; UniProt/PubChem are the source-of-truth layer for biochemists.
Yes, fully free, no signup, no paywall. Browse all 60+ compounds at /library. The comparison tool and dosing calculator are free too.
Monthly for compounds with active literature (new trial data, new systematic reviews). On-demand when significant new evidence publishes. Regulatory status changes (FDA compounding list updates, WADA list changes) are updated within a few days.
Specialised niche compounds and newly-synthesised research tools are the main gap. Use the URL-import workflow at /library — paste any vendor product URL and the compound is added to the library in under a minute, then it's available in the comparison tool for you and everyone else.
Karl Vorwerg, founder and lead researcher. Content is technically reviewed against PubMed, PubChem, and primary clinical literature. See the About page for methodology and sourcing details.
This article is for research and informational purposes only. The compounds in the Next Pep library are, in most cases, not FDA-approved for human clinical use. Consult a licensed healthcare professional before considering any peptide protocol.
Research Disclaimer. All content on Next Pep is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Consult a licensed healthcare professional before considering any peptide protocol.
Peptide reconstitution errors are the most common dosing mistake. Free calculator covering insulin syringe units, BAC water volumes, and vial concentration math.
Most peptide comparison content is vendor marketing. A mechanism-first framework for comparing any two peptides on data that actually predicts outcomes — plus a free tool.