Frequently asked questions

"Stack" is a community word, not a research word. It means using more than one compound at a time. Published studies rarely work that way: most test one compound alone, in animals or small human groups. Our atlas maps where that overlap has and hasn't been studied.

From the record only. Co-administered: a published study gave both compounds together. Co-studied: both appeared in one study, but weren't combined. Mentioned together: review articles name them side by side, with no combined data. No record: nothing published looked at the two.

Because that's the truth. Of the 120 possible pairs among our sixteen compounds, 68 have no published record of being studied together. Forum popularity isn't evidence, and we won't pretend it is.

It weights each pairing in your chosen research areas by how strongly it was studied together, then averages them. A high score means real co-administration data exists. It measures how much research there is, never how well something works.

No. It only says there's more research. A well-studied pairing can still be wrong for one person, and a thin one isn't automatically unsafe. That call belongs with a prescriber.

Because it reports two things: the published record grade, and our reading of how the two mechanisms relate. Where those differ from forum lore, we show the citation so you can check it yourself.

Two compounds acting on the same receptor overlap; they don't add up. Two growth-hormone-releasing-hormone analogues are an example. Two compounds hitting different receptors toward the same end can complement each other, which is a different situation.

We count and show them separately everywhere, and never merge them. Animal and lab work shows a mechanism is plausible. It doesn't tell you what happens in people, at what amount, or with what risk.

Roughly: phase 1 looks at safety and handling in a small group. Phase 2 looks for a signal and at what amount. Phase 3 tests that against a comparator in a large group. A compound with only phase 1 records is much earlier along than one with completed phase 3 trials.

A big record count often reflects lab and animal interest, not clinical progress. That's why our evidence page splits the two instead of showing one total.

PubMed and ClinicalTrials.gov, pulled directly. Every study link on this site goes to the record itself, not a summary.

No. If we couldn't retrieve a record, we don't cite it. When a check was blocked, like a lab verification portal, we say it was blocked instead of implying it passed.

Because nobody can set an amount for one person from a web form. We publish what published trials and approved labels actually used, with the source on every row. Turning that into your amount takes a licensed prescriber who knows your history.

Trial arms and approved drug labels, copied as published, with a PubMed ID or trial number on every row. If a source doesn't state a frequency, timing or route, the cell says "not stated". We don't fill it in.

Because no published human study set one. About half of this catalog is in that spot. Filling those tables with forum numbers would mean inventing figures, and we don't do that.

Mostly no. Two have approved labels. The rest are research-grade material with no approved human use, which is exactly why we say research use only throughout.

It means the material is sold for lab research, not as a medicine, and no regulator has cleared it to treat anyone. It's not a formality, and it's not a wink.

No. If you flag a condition in the quiz, your result tells you to take it to a prescriber and changes nothing else. We don't adjust any published figure for any person.

It's a lab document for one batch, stating identity, purity and contamination screens. It tells you about the batch it names. It's not a permanent fact about a brand, and one batch's certificate says nothing about another.

A named lab, a named batch, the method used for identity and purity, a stated release criterion, and the contamination panels. A document with just a purity number is weak evidence.

Aligned means the lab runs its quality system to that standard. Accredited means an accreditation body has assessed and certified it. They're not the same, and we keep the difference every time, because blurring it would be false.

It's a screen for a dangerous contaminant. It isn't standard on peptide certificates, so its presence shows what the supplier chose to test for beyond the basics.

Sterile water with a preservative, used in labs to reconstitute freeze-dried material. It has its own approved label, which is the source we cite for it.

Peptara Labs describes itself as a research-grade peptide supplier and education resource. Its catalog lists research-grade compounds, with third-party certificates of analysis published where available.

Peptara Labs LLC is a registered United States company, Wyoming, Filing ID 2026-002031026, with a business address at 30 N Gould St Ste 66115, Sheridan, WY 82801. It publishes third-party certificates of analysis and states a 60-day money back guarantee on verified purity, certificate of analysis and fulfilment. Those are the facts on record. The conclusion is yours.

Registered in Wyoming, United States, with its business address in Sheridan, Wyoming, under Filing ID 2026-002031026. The company describes no separate office, lab or warehouse, so we don't either.

Titreon Analytical, described on the company's trust page as a third-party laboratory whose quality system is aligned to ISO/IEC 17025:2017, not itself accredited. A second laboratory, Janoshik, supplies independent bacterial endotoxin reports on the BPC-157 and GHK-Cu batches.

On its certificates page, listed by lot with the testing laboratory named. Neither retatrutide nor tirzepatide appears there now.

The release criterion is not less than 95.0 percent by chromatographic purity, and each certificate gives the measured figure for its lot.

A 60-day money back guarantee. You have 60 days from delivery to send a vial to an outside lab, and you get a full refund if it doesn't test as its certificate says or the order wasn't handled correctly. It's a quality guarantee, never a promise about a health outcome.

Two separate published figures: 4.96 stars across more than 400 verified order reviews, each tied to an order, and 5.0 stars across 39 reviews on the public Google Business Profile. We keep them apart instead of averaging them into one number.

The company states worldwide shipping on its own page. We repeat that and name no country, because the record names none.

No. Your answers stay in your browser. There's no account, and nothing you type is sent anywhere.

It rewards reading the evidence: finishing the builder, running the checker, opening a citation. It's stored in your browser only and has no effect on what the research says.

We do, the small team behind this site. When a claim comes from a document, we link the document. When we couldn't finish a check, we say so.