About
PeptideCheckup Ltd
Est. 2026
United Kingdom
The independent stockist of the AERVYN range.
Peptide Checkup stocks 24 pre-filled AERVYN peptide pens in the United Kingdom, publishes the independent laboratory certificate for every lot, and puts a Checkup in front of the shop that can end at no pen at all. We sell what we grade — so the rules that keep the two apart are written down here.
Why this exists
Interest in peptides has run far ahead of the information available about them, and further still ahead of the quality of what is sold. Some compounds are licensed medicines with large trials behind them; many have never been studied in humans. Which category a compound is in matters more than anything an advert says, and whether it is worth discussing at all depends on your own history and medicines. Meanwhile the product itself — what is actually in it, and how much — is rarely tested by the people selling it, and the format usually leaves the buyer to reconstitute a powder and draw it up.
Peptide Checkup exists to do three things properly and join them together: a small range in one honest format, a laboratory certificate for every lot, and an assessment that collects your history in a structured way and lands on a pen only where the record supports it. The Checkup is free and does not change based on what you might buy.
The range
24 pens, all pre-filled, all 3 mL, all dose-dial, in 7 of the manufacturer's categories (recovery & repair, longevity & energy, skin & beauty, metabolic & weight, growth & body, hormones & sexual health and immune & gut): Tesamorelin, MOTS-C, GHK-Cu, NAD+, Wolverine, Klow, Glow, KPV, Retatrutide (R3T), BPC-157, CagriSema, CJC-1295 (no DAC), Epitalon, FOXO4-DRI, Gonadorelin, Ipamorelin, Liraglutide, LL-37, PT-141, Semaglutide, Sermorelin, TB-500, Thymosin Alpha-1 and Tirzepatide. 20 are single compounds and 4 — Wolverine, Klow, Glow and CagriSema — are blends, graded per component. Everything in the range is supplied for research use and the labelling says so. Some compounds — Tesamorelin, Semaglutide, Gonadorelin, Liraglutide, PT-141 (bremelanotide) and Tirzepatide — are authorised medicines in other countries; the pens are research products of the same compounds, not those medicines, and the pen page says so. There are no other products, no supplies and no consultation services. The shop shows the current price in GBP and the lot for each pen.
Principles
- 01One formatEvery product is the same object: a pre-filled 3 mL dose-dial pen from one manufacturer, priced in sterling from the manufacturer's list at a fixed, published rate. No vials, no diluent, no kits, no supplies. If a compound does not suit the format, it is not in the range.
- 02Test every lotNo lot is listed until an independent laboratory has confirmed identity by LC-MS, purity by HPLC and endotoxin by LAL — per component for blends. A lot that fails is not sold at a discount; it is not sold.
- 03Publish the certificateThe certificate is published as issued, against the lot number printed on the carton, and a copy travels in the box. If you cannot find the certificate for your lot, the pen is not ours.
- 04Grade evidence the same wayHuman trials and regulator labels decide the grade. Animal data, anecdote and marketing do not. A compound we sell is graded by the same criteria as one we do not, and the pen page shows the compound’s grade unchanged.
- 05Tell people when not to buyThe Peptide Checkup exists to say no as readily as yes. A Higher-concern label or a high flag ends at “not recommended”; nothing is added to the cart, the report explains which answer caused it, and it points to a clinician.
What we are not
- Not a clinic or a healthcare provider. Nobody here is your clinician, and using the site or buying from it does not create a professional relationship. See the terms.
- Not a pharmacy. Nothing in the range is supplied as a licensed medicine and we sell no prescription-only products. Where a compound is an authorised medicine elsewhere, the pen is a research product, not that medicine. Where the Checkup points you to a clinician, that is a recommendation to see one, not an introduction to one.
- Not a marketplace, and not the manufacturer. Every pen is made by AERVYN, stocked by us and tested by a laboratory we chose and pay for. There are no third-party sellers, affiliate links or sponsored placements.
- Not an AI chatbot. There is no language model in the pipeline. Reports and matches are assembled from database fields by fixed, reviewable rules.
- Not an advocate for or against peptides. Where the evidence is strong we say so; where it is absent we say that too, in the same type size — including on the pen page.
- Not a data business. There are no accounts, no tracking by default, and your assessment answers stay in your browser. See the privacy notice.
Who we are
This site is operated by PeptideCheckup Ltd, a small, independent company, with clinical, pharmacy, analytical and engineering backgrounds on the team. The pens are made by AERVYN (Performance Science); we are their official stockist, not the manufacturer, and we say so wherever a lot, a certificate or a label is discussed. Compound records are written from regulator labels and peer-reviewed trials and reviewed before publication; the rules engine and the matcher are reviewed against the same sources; pens are held until the laboratory result for the lot is in.
Contact
Corrections, questions, order problems and requests to delete your data all go to hello@comparepeptide.co.uk. A person reads every message. If you are a clinician, pharmacist or analytical chemist who would like to review records, rules or certificates, we would like to hear from you.
Peptide Checkup
Find your pen in 7 minutes.
Not medical advice · Research-use labelling applies · 18+ only · It can say no