If you have started looking into peptides for recovery or training support, the hard part is not finding a supplier. It is working out which ones are telling you the truth. The Canadian market has grown quickly, the claims all sound alike, and almost none of them can be checked from a product page.
Here is a checklist you can run on any supplier in about ten minutes, before you spend anything.
Does the lab report resolve somewhere the seller does not control?
This is the single most useful test, and most suppliers fail it. A Certificate of Analysis hosted as a PDF on the seller’s own website proves very little — nothing stops a file being edited before it is uploaded. What you want is a report you can pull up on the testing laboratory’s own portal, one that returns the client name and the batch code when you look it up.
That distinction does more work than any badge, testimonial or review count. If a supplier’s testing exists only as files they host themselves, you are trusting the seller, not the lab.
Is there a visible spread in the published results?
A testing page showing nothing but 99%-plus purity across every product is either an extraordinarily consistent operation or a curated selection, and you cannot tell which from the outside. A set with a visible range — including a few results in the low nineties — is behaving like a record rather than a brochure.
As a worked example: Growth Guys, a Canadian supplier, publishes 236 third-party reports through Janoshik Analytical covering 132 products. Of the 175 that state a purity figure, the average is 99.03%, the range runs from 93.84% to 99.99%, and 32 come in below 98%. Those 32 are the interesting ones. Somebody chose not to tidy them away.
Where does it ship from?
For a Canadian buyer this matters more than most people expect, and it is often worth more than any discount. A domestic shipment moves inside the country and arrives. An international one introduces a customs step, and a customs step introduces delay, unbudgeted fees, and the possibility of a parcel simply stopping. Check the shipping policy before anything else — it is the failure people actually regret.
What is the recourse if something goes wrong?
Ask how the supplier handles a problem, and look at how you are paying. Some payment methods carry a chargeback route and some do not. This is structural to how much of this industry operates rather than a mark against any one seller, but it belongs in your thinking before you order rather than after.
Do the public claims survive a two-minute check?
Any claim a supplier makes that you can test yourself is worth testing, because it tells you how carefully they make the ones you cannot test.
Discount codes are the easiest example. Open the store in a signed-out window, add any item, enter the code at the cart stage before the payment step, and read the discount line against the subtotal beside it. It either does what it says or it does not, and you have paid nothing to find out.
Growth Guys publishes HEALTHYLIFE10 for 10% off sitewide with no minimum purchase and no product exclusions, and the readings behind that claim are published rather than asserted — every dated test, including any that failed, sits at growthguyshealthylife10.ca/archive.html.
The point is not the ten percent. It is that a supplier willing to publish the failures alongside the passes is telling you something about how they handle the claims you cannot verify yourself.
What this checklist will not tell you
Be clear about the limits. None of this speaks to how a compound behaves, whether it suits you, or whether you should be taking it at all. Those are questions for a qualified professional, not a sourcing checklist. What these five checks establish is narrower and still useful: whether the person selling to you can back up the things they say in public.
For a scored comparison across several Canadian suppliers using a published rubric, there is an index at canadianpeptidereviews.ca that applies the same criteria to each one, so you can inspect the reasoning rather than take a ranking on faith.
Run the five checks. Most suppliers fail the first one, which will save you the other four.
