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The Senzu blog

Peptides, explained from the evidence.

Independent explainers with front-loaded answers, primary sources, and clear regulatory status. We don’t sell peptides.

Explainers

What are peptides? A plain, evidence-first explainer

Short chains of amino acids, and the reason the label rarely tells you what is in the bottle.

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Evidence

BPC-157 evidence: how to read the studies people cite at you

The BPC-157 research base is genuine and consists overwhelmingly of cell and animal injury models, mostly in rats.

Comparisons

BPC-157 vs TB-500: comparing two compounds with no human evidence

BPC-157 and TB-500 are the two most widely sold repair peptides and both sit at the bottom of our evidence ratings.

Comparisons

CJC-1295 vs ipamorelin: two receptors, one stack, no established benefit

Two growth-hormone peptides usually sold as a pair, and what actually separates them.

Explainers

9 stories

What is BPC-157? The evidence gap behind the most-sold repair peptide

BPC-157 is a 15-amino-acid peptide studied for musculoskeletal and gastrointestinal repair.

What is CJC-1295? One name, two different moleculesCJC-1295 is an unapproved GHRH-receptor agonist studied in small healthy-volunteer trials.What is GHK-Cu? The copper peptide in your serum is not the vial onlineGHK-Cu is a naturally occurring copper-binding tripeptide, sold both as a cosmetic ingredient and as injectable research material.What is ipamorelin? It was tested in a randomized trial and missed its endpointsIpamorelin is an unapproved ghrelin-receptor agonist and growth-hormone secretagogue with limited clinical development.What is retatrutide? An investigational triple agonist, and what 44 lab records showThe most-tested compound in our ledger is one nobody has approved.What is semaglutide? Approved uses, evidence, and what the grey market actually sellsThe most-studied peptide in the GLP-1 class, and what the approvals actually cover.What is TB-500? A fragment sold on another molecule's researchTB-500 is a synthetic acetylated peptide corresponding to residues 17 through 23 of thymosin beta-4.What is tesamorelin? An approved drug being sold into the wrong marketApproved, but for a narrower use than the marketing around it suggests.What is tirzepatide? Approved uses, evidence, and what 33 lab records revealApproved for weight loss, and what our lab records show about what is in the vial.

Comparisons

2 stories

Retatrutide vs tirzepatide: the comparison itself is the sales pitch

Retatrutide targets three receptors and tirzepatide targets two, which is why the pairing gets framed as next-generation versus current.

Semaglutide vs tirzepatide: what the evidence lets you compareSemaglutide activates the GLP-1 receptor.

Evidence

1 story

Why evidence maturity matters more than online momentum

Popularity and proof answer different questions.

Safety

1 story

Retatrutide safety: what a phase 2 trial can and cannot tell you yet

Retatrutide's human safety evidence rests on a randomized phase 2 trial in 338 adults over 48 weeks.

Market

4 stories

The changing economics of medically supervised weight care

Why the same drug carries wildly different prices depending on who supervises it.

GHK-Cu price: the cheapest compound we track is also the least accurateGHK-Cu is listed from $20.00 to $89.00 across 22 vendors, putting it among the cheapest compounds in our price market.What does semaglutide actually cost? Two markets, two very different answersThere are two semaglutide markets and they are not comparable.What does tirzepatide cost? The price changes as your dose goes upZepbound self-pay pricing is tiered by dose.

Testing

2 stories

How to evaluate a peptide vendor

What a third party can confirm, and what is only marketing.

How to read a certificate of analysis without guessingIdentity, purity, quantity, and the one field vendors quietly leave untested.

How we evaluate evidence →

Before you continue

Senzu is an independent research reference. We document the peptide market — vendor listings, third-party lab records, and published research. We do not sell peptides, and nothing here is medical advice or a dosing recommendation.

A listing is not an endorsement, a safety certification, or a statement that a product is legal or approved where you live. Most compounds documented here are not approved by the FDA or MHRA for the uses discussed.

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