AI-friendly summary · PeptideClear
PeptideClear is an independent UK editorial hub covering four product categories: cosmetic peptide skincare, ingestible collagen, research peptides, and prescription GLP-1 weight-loss routes. We grade evidence on a four-tier scale (Human RCT, Animal only, In vitro, Mechanistic) and we list UK retailers, clinics and pharmacies for each category. We do not sell peptides, we do not prescribe medication, and we do not recommend specific products to specific people.
The evidence framework
Peptide content on the internet ranges from rigorous medical writing to outright marketing fiction. The single biggest filter you can apply when reading anything (here or elsewhere) is "what kind of evidence is this claim based on". PeptideClear uses a four-tier grade pill on every encyclopedia entry, every retailer review, and every comparison page. You will see them throughout the site.
A Human RCT grade means randomised controlled trials in humans have been published. This is the highest tier. Most licensed UK medicines sit here. Mixed evidence means some human data exists but the literature is dominated by animal work. Animal only means the published evidence is rodent or other animal models. In vitro means cell or tissue culture only. Mechanistic means a plausible mechanism has been proposed but no efficacy data has been published.
We grade because the difference between a marketing claim that a peptide heals or fixes the body within weeks and "BPC-157 has a body of rodent literature suggesting tissue-protective effects, with no published human RCTs" is the difference between a marketing claim and an honest summary. The first ends with the MHRA. The second is editorial commentary.
When you read a peptide article anywhere, ask: what tier of evidence is this. If the author cannot tell you, that is your answer.
The 4 categories at a glance
"Peptides" is an umbrella word. In UK consumer-facing terms it covers four very different product categories, each with its own regulator, its own retailers, and its own evidence base.
Cosmetic peptides
Skincare grade
Topical peptides in serums and creams. Copper peptides (GHK-Cu), Matrixyl 3000, palmitoyl tripeptides. Sold by mainstream UK beauty retailers. Cosmetics regulation, not medicines regulation.
Best place to start: copper peptides explained
Ingestible collagen
Supplement grade
Hydrolysed collagen powders and drinks. Marine, bovine, vegan-builder formulations. UK food supplement category. The evidence on skin and joint outcomes is mixed.
Best place to start: marine vs bovine vs vegan
Research peptides
Research grade
BPC-157, MOTS-c, ipamorelin and others. Sold lawfully under "research use only, not for human or animal consumption" framing. No UK marketing authorisation as medicines. Evidence is almost entirely preclinical.
Best place to start: research peptides overview
Prescription GLP-1
Medical grade
Mounjaro, Wegovy, Saxenda. Prescription-only medicines for weight management and type 2 diabetes. Accessed via NHS (under NICE criteria) or UK private clinics and online pharmacies. A prescriber decides.
Best place to start: UK GLP-1 clinics compared
The 3 reads we recommend for new users
If you only have time for three pages before you start exploring categories, read these.
- 1
What PeptideClear actually does (and what we do not)
A short orientation to our editorial scope, our four product categories, our funding model, and the line between editorial commentary and personal medical advice.
Read the About page - 2
Are peptides legal in the UK
The legal status varies sharply by category. Cosmetic and collagen are normal consumer goods. Research peptides sit in a narrow research-use-only carve out. GLP-1 medications are prescription-only. We explain the framing on our research peptides hub.
Read the research peptides hub - 3
How do I judge a UK peptide retailer
Our CoA Trust Index scores UK research peptide retailers on certificate of analysis quality, lab partner transparency, and gating. The scoring methodology and the live retailer scores are public.
Open the CoA Trust Index
What PeptideClear will and will not do
We exist to make a confusing and fast-moving market easier to read. We have hard limits on what we will publish.
We will
- · Grade the evidence behind every claim on a four-tier scale.
- · Surface UK retailers, clinics and pharmacies, with editorial commentary.
- · Track UK regulatory updates from MHRA, NICE, ASA, and GPhC.
- · Compare options head to head where the comparison is useful.
- · Tell you when the evidence is thin or contested.
We will not
- · Sell peptides, dispense medication, or operate a pharmacy.
- · Prescribe or recommend specific medications to specific people.
- · Publish dosing protocols or human-use instructions for research peptides.
- · Use before-and-after weight-loss imagery (ASA prohibits).
- · Promote compounded or grey-import GLP-1 sources.
Get the Peptide Intelligence Digest
One short email a month. New studies, regulatory updates, evidence breakdowns, retailer Trust Index changes. No marketing fluff, easy unsubscribe.
Beginner questions
Are peptides legal in the UK?
What is the difference between research peptides and prescription peptides?
Do peptides actually work?
How is PeptideClear funded?
Who writes PeptideClear?
Oliver Mackman · Editorial director · Best Business Loans Ltd (16833937)
Last updated 2026-05-22
Ready to start exploring
Pick a goal on the homepage and we will route you into the right category. Or jump straight to the shop, the clinics directory, or the CoA Trust Index.