Independent · referenced · UK-focused
The careful guide to research peptides.
Plain-English research guides to peptides sold in the UK: what each compound is, what the published studies used, reconstitution maths, storage, UK legal status and how to judge a supplier.
Most-researched compounds
Retatrutide
Reta · RT-3 · LY3437943
GLP-1 & incretinsTirzepatide
Mounjaro · Zepbound · Tirz
GLP-1 & incretinsSemaglutide
Wegovy · Ozempic · Rybelsus
Tissue repairBPC-157
BPC 157 · BPC157 · Body Protection Compound-157
Tissue repairTB-500
TB500 · Thymosin Beta-4 · Tβ4
Skin & hairGHK-Cu
GHK Cu · Copper peptide · Copper tripeptide-1
BlendsWolverine stack
BPC-157/TB-500 blend · Wolverine blend · BPC TB
MetabolicMOTS-c
MOTS c · MOTSc · Mitochondrial ORF of the 12S rRNA type-c
Start with the fundamentals
How to reconstitute peptides
Lyophilised (freeze-dried) peptides have to be dissolved before use. Doing it carefully protects the peptide and makes every later measurement accurate.
GuideBacteriostatic water (bac water) explained
“Bac water” is the standard liquid for dissolving lyophilised peptides because its preservative lets one vial be used many times.
GuidePeptide storage and stability
Most peptide degradation happens through heat, moisture, light and repeated temperature cycling. Good storage is simple once you know which state the peptide is in.
GuideHow to read a peptide certificate of analysis (COA)
A certificate of analysis is the only evidence you have that a vial contains what the label says. Here is how to tell a meaningful one from a decorative one.
GuideConverting syringe units to mg and mcg
Syringe “units” measure volume, not amount. The amount of peptide in 10 units depends entirely on how the vial was reconstituted.
GuideGLP-1 drugs and their brand names
Most confusion about weight-loss injections comes from brand names. Here is which molecule is behind each one.
Dosing in the literature
What published trials actually used — with reconstitution tables and a calculator for each vial size.
Retatrutide dosage
10 / 15 / 20 mg vial tables
Dosing & mathsBPC-157 dosage
5 / 10 mg vial tables
Dosing & mathsTirzepatide dosage
10 / 15 / 30 mg vial tables
Dosing & mathsCJC-1295 dosage
2 / 5 / 10 mg vial tables
Dosing & mathsTesamorelin dosage
10 mg vial tables
Dosing & mathsMOTS-c dosage
10 mg vial tables
Head-to-head
Tirzepatide vs Semaglutide
Tirzepatide vs semaglutide compared: SURMOUNT-5 head-to-head weight-loss results, mechanisms, side effects, dosing and UK availability of Mounjaro and Wegovy.
CompareRetatrutide vs Tirzepatide
Retatrutide vs tirzepatide: triple vs dual agonist, phase 2/3 weight-loss data, side effects and why only one is licensed in the UK.
CompareBPC-157 vs TB-500
BPC-157 vs TB-500 compared: origin, mechanism, strength of evidence, safety and why they are often combined as the Wolverine stack.
CompareSemax vs Selank
Semax vs Selank compared: two Russian-developed nasal peptides — one for cognition and stroke, one for anxiety.
CompareMelanotan 2 vs PT-141
MT-2 vs PT-141: how a tanning peptide became an FDA-approved libido drug.
CompareTesamorelin vs Ipamorelin
Tesamorelin vs ipamorelin compared: two different routes to raising growth hormone, the clinical evidence for visceral fat, side effects and approval status.
CompareCJC-1295 vs Ipamorelin
CJC-1295 vs ipamorelin: GHRH analogue vs ghrelin mimetic, DAC vs no-DAC, human data and the rationale behind the CJC/Ipa blend.
Tools for the bench
Referenced supplier
UK prices in this library reference Pristine Peptides, a UK research-peptide supplier that publishes batch certificates of analysis. We say so openly — read our disclosure.
Browse Pristine Peptides