Notes
Research & notes
Claim-free literature overviews, analytical methodology, and batch announcements.
Where to Buy Peptides in Canada (Research Use): How to Judge Any Supplier, Including Us
Written by a Vancouver peptide supplier: the checks we would run on any Canadian store, including us, with shipping costs and times by province, certificate questions and payment options.
Where to Buy Retatrutide in Canada (Research Use)
Kits Peptides sells retatrutide in 5 mg and 10 mg vials from Kitsilano, Vancouver, with supplier certificates of analysis, tracked Canada Post shipping and same-day Metro Vancouver delivery.
Retatrutide Starter Kit (Canada): What's Included
What the Kits Peptides retatrutide starter kit includes, how it compares to buying vials separately, and how it ships from Vancouver.
Why a 5 mg Vial Costs More Than Another 5 mg Vial
Two vials, same mass, ten times the price. The answer is chain length, and it is visible in the molecular formula before you ask anyone.
What a CAS Number Actually Tells You (and What It Does Not)
A CAS number identifies a substance unambiguously. It says nothing about purity, quality, or whether the vial in front of you contains what the label claims.
Reading a Peptide Molecular Formula
C221H366N72O67S looks like noise. It is not: the sulfur predicts an oxidation risk, the size predicts the price, and the absence of a metal tells you what class of substance you have.
TB-500 vs GHK-Cu: The Largest and Smallest in the Catalogue
A 4,963 g/mol peptide against a 402 g/mol copper complex. A twelvefold size difference changes everything about how the two are made, priced and handled.
Ipamorelin vs Tesamorelin: Different Receptors, Seven Times the Size
A 712 g/mol pentapeptide acting at one receptor family against a 5,136 g/mol GHRH analogue acting at another. Almost nothing about these two is comparable except that people compare them.
Peptide Comparisons: The Full Index
Every side-by-side in one place, grouped by what the compounds actually have in common: receptor family, molecule class, or nothing but a reputation for being similar.
PT-141 vs Melanotan II: One Gram per Mole Apart
Two melanocortin peptides separated by 1 g/mol in molecular weight and by a single structural change. A case where near-identical mass makes mass spectrometry alone a weak identity check.
Tesamorelin vs CJC-1295: Two GHRH Analogues, Very Different Sizes
Same receptor family, same design idea, and a 1,700 g/mol gap between them. What that gap means for synthesis, purity and price.
Ipamorelin vs CJC-1295: Two Different Molecule Classes
One is a small pentapeptide, the other is nearly five times its size and works on a different receptor family entirely. The comparison people make most often is between two things that are not the same kind of thing.
BPC-157 vs GHK-Cu: A Peptide and a Metal Complex
One is a 15-residue peptide. The other is a tripeptide bound to a copper ion, which makes it a different class of substance with different handling, different failure modes, and a colour you can check.
Why Two Suppliers Quote Different Purity for the Same Peptide
Synthesis route, deletion sequences, counterion content and the difference between HPLC purity and net peptide content: why 99% from one supplier is not 99% from another.
How to Spot a Forged Certificate of Analysis
Eleven checks that separate a real third-party certificate from a PDF someone made in an afternoon. Run them on any supplier, including us.
What "Research Use Only" Actually Means
RUO is not a decoration on the label. What the designation means, what it asks of a supplier, and what it does not change under Canadian rules.
Retatrutide vs Tirzepatide: Receptor Targets and Handling
Two incretin-class research peptides compared on receptor selectivity, structure, stability and how each is handled in the lab.
Reconstituting Lyophilized Peptides: A Metro Vancouver Lab Guide
Choosing a diluent, keeping the vial sterile, working out the resulting concentration, and storing the solution afterwards — with local notes for Metro Vancouver labs.
Melanotan II: A Research Primer
What Melanotan II actually is: a synthetic cyclic heptapeptide analog of alpha-MSH (MT-2), its lactam ring and sequence notation, the chemistry on the label, and how each lot is tested.
Retatrutide vs Semaglutide: Identity and Chemistry Compared
Retatrutide and semaglutide compared on identity alone: a triple receptor agonist against a single GLP-1 agonist, with CAS numbers, formulas, molecular size, and how each lot is tested.
Tirzepatide vs Semaglutide: Identity and Chemistry Compared
Tirzepatide is a GLP-1/GIP dual receptor agonist and semaglutide is a GLP-1 receptor agonist: an identity comparison of CAS numbers, formulas, form and lab testing, not effectiveness.
Retatrutide: A Research Primer
What retatrutide is at the identity level: a synthetic 39-amino-acid GLP-1/GIP/glucagon triple receptor agonist coded LY-3437943, its CAS and formula data, and how each lot is handled and tested.
Semax: A Research Primer
What Semax actually is: a synthetic heptapeptide (MEHFPGP) built as an ACTH(4-10) analogue, its CAS and formula data, the research fields that reference it, and how it is handled and tested as a reagent.
PT-141: A Research Primer
What PT-141 (Bremelanotide) actually is: a synthetic cyclic melanocortin peptide, its CAS number and formula, the sequence on the label, the research field that references it, and how each lot is tested.
Selank: A Research Primer
What Selank is: the synthetic tuftsin analog's identity, its CAS and formula data, the neuropeptide and behavioural research areas that reference it, and how it is supplied and tested as a reagent.
Semaglutide: A Research Primer
Semaglutide explained: a long-acting GLP-1(7-37) receptor agonist analog, its CAS number and molecular formula, the backbone sequence and side-chain chemistry, the research field it appears in, and how each lot is handled and tested.
Tesamorelin: A Research Primer
Tesamorelin explained: the identity of this stabilized GHRH(1-44) analog, its CAS and molecular-formula data, the research field that references it, and how it is supplied and tested as a reagent.
Tirzepatide: A Research Primer
What tirzepatide is at the identity level: a synthetic 39-amino-acid dual GIP/GLP-1 receptor agonist, its CAS number and formula, the research field that references it, and how it is handled and tested as a laboratory reagent.
CJC-1295 (no DAC): A Research Primer
What CJC-1295 (no DAC) is: a synthetic modified GRF(1-29) analog, also called mod GRF 1-29, with its CAS number and formula, the research field that references it, and how each lot is handled and tested as a reagent.
Buying Research Peptides in Vancouver
Why buying research peptides in Vancouver means no customs and same-day dispatch, why the certificate still matters more than the postcode, and what BC researchers should check before ordering.
BPC-157 vs TB-500: How They Differ
BPC-157 and TB-500 side by side on identity alone: different parent molecules, a 15-residue chain versus a 43-residue N-acetylated one, different CAS numbers, and the separate research fields each appears in.
Ipamorelin: A Research Primer
What Ipamorelin actually is: a synthetic pentapeptide growth hormone secretagogue and ghrelin-receptor ligand, its chemistry and CAS number, the research field it turns up in, and how each lot is handled and tested.
TB-500: A Research Primer
What TB-500 actually is: a synthetic 43-amino-acid peptide (CAS 77591-33-4), an N-acetylated fragment related to Thymosin Beta-4, the research fields it appears in, and how each lot is tested.
Semax vs Selank: A Research Comparison
Semax and Selank compared by identity, not effect: an ACTH-related heptapeptide versus a tuftsin analog, their sequences and CAS numbers, and how each lot is supplied and tested.
GHK-Cu: A Research Primer
GHK-Cu explained: the copper-binding tripeptide's identity, chemistry and CAS data, the research areas it appears in, and how it is supplied and tested.
BPC-157: A Research Primer
What BPC-157 actually is: a synthetic 15-amino-acid partial sequence (PL 14736), its chemistry and CAS number, and how each lot is tested.
What HPLC Purity Percentage Actually Tells You
HPLC purity measures one narrow thing: the target peak's share of total detected area. Here is what that number hides, and why baseline, wavelength, and identity all matter.
Storing Lyophilized Research Peptides: A Handling Reference
Why research peptides ship freeze-dried with mannitol, and how to store the reagent at -20C, in the dark and sealed, with the chemistry behind each rule.
Third-Party vs In-House Peptide Testing: Why It Matters
Why an independent lab number beats a supplier grading its own product, what third-party really means, and how to tell which test a COA is actually showing you.
How to Read a Peptide Certificate of Analysis (Using Two From Our Library)
A plain-language walkthrough of HPLC purity, mass-spec identity, and potency on a real peptide COA, worked through two supplier certificates from our library.
How a Lot Moves From Receiving to Release
What actually happens to a lot between arrival and going on sale — including which lots carry a certificate and which do not.