SARMs vs peptides: what's the difference?

A SARM, short for selective androgen receptor modulator, is a small synthetic molecule built to bind the androgen receptor. A peptide is a chain of amino acids joined by peptide bonds. Those are two different chemical classes, and nearly everything that separates them as research materials follows from that one fact.

The two names get used interchangeably in buying conversations, because both are sold as research chemicals in vials to the same audience of laboratories. Separating the chemistry first, then the paperwork, resolves most of the confusion.

What each one is made of

A peptide is assembled from amino acids, and the number of residues and their order set the molecule's mass. Three peptides from our catalog show how wide that range runs:

Within the peptide class the differences are still chemical, and often smaller than the gap between any peptide and a SARM. A copper-bound tripeptide is a different molecule from the same sequence without the copper, which is what GHK-Cu vs GHK basic sets out. Adding a drug affinity complex to CJC-1295 changes its mass by about 280 g/mol while leaving the sequence between the caps untouched, as CJC-1295 DAC vs no-DAC explains.

How each class is identified on a lab report

The sequence is what makes a peptide straightforward to verify. BPC-157 runs 15 residues, GEPPPGKPADDAGLV, and its expected mass is 1419.53 g/mol. A report should show an observed mass close to that figure, measured by mass spectrometry. TB-500 sits at 4963.44 g/mol, and BPC-157 vs TB-500 shows how far apart two peptides land on that same line.

Mass spectrometry identifies any molecule, SARMs included, so the method is not what differs. What differs is what you can check the result against. For a peptide, the expected value can be worked out from the published sequence and compared with the number on the page. A SARM has no residue sequence to read, so there is less to verify it against.

The rest of the report is the same document for either class, and the requirements do not move:

• an independent, named lab that ran the test
• a batch number that matches the batch code on the vial
• a test date later than the vial's fill date
• purity by HPLC, with mass spectrometry alongside it

How to read a peptide lab report walks through each line and what a faked or recycled report looks like. Every pepuro vial carries a QR code that opens the report for its own batch, so the numbers can be checked against the vial in your hand rather than against a PDF on a product page.

How each category is sold in Canada

Both peptides and SARMs are sold as research chemicals for in-vitro laboratory use. Neither is a drug, a supplement, a food or a cosmetic, and neither is approved by Health Canada for human or animal consumption. The label sets the terms of the sale, and the terms apply the same way to both classes.

That puts the emphasis on intended use rather than chemistry. A supplier selling either category for laboratory research is operating inside those terms, and a supplier describing either category in any other way has stepped outside them. Are research peptides legal in Canada? covers how research chemicals are treated, and what research use only means covers the wording a buyer agrees to at checkout. This page is general information, not legal advice.

Buying peptides in Canada

pepuro stocks peptides and does not carry SARMs, so anyone looking for a SARM is ordering elsewhere and should apply the same checks there. Four of them, in order of how much each one tells you:

1. Is there a lab report for the batch in your vial, or only a PDF for the product line?
2. Is the lab that ran the test named, and independent of the seller?
3. Does the mass-spec result match the expected value for the molecule?
4. Does the supplier ship from within Canada, or does the parcel cross a border?

A domestic order arrives without a customs hold, and the import obligation on a parcel entering Canada sits with the receiver. Buying research peptides in Canada covers the domestic process start to finish.

Comparison pages go further into the peptide side of the market: cagrilintide vs semaglutide puts an amylin analog beside a GLP-1 analog, and what are research peptides covers the category itself.

Every pepuro vial ships free from our Calgary, Toronto and Vancouver distribution centers, dispatches the same business day your e-Transfer clears, and carries a QR code on the vial that opens its independent, third-party lab report.

For research use only. Not for human or animal consumption.