Subject: Introducing Peptidology: Testing Taken To A New Level
From: Derek from Peptide Price <[email-masked]>
To: [email-masked]
Date: Tue, 24 Mar 2026 15:15:15 +0000
List-Id: <derekpruski.substack.com>

View this post on the web at https://derekpruski.substack.com/p/introducing-peptidology-testing-taken

Without question the best-tested company I’ve come across in this space — and one of the first to do it at this level.
Peptidology takes a different approach to the research space. Their goal is to do the maximum amount of testing possible to ensure their products are the highest quality. Most vendors stop at purity. Peptidology doesn’t. Here’s what they test for on every batch:
Net content
Net purity
Endotoxins
Heavy metals
Sterility
Double sterility
That last one is worth unpacking. They send samples to two entirely separate laboratories to confirm sterility passes — because sterility is the most critical and most overlooked area of testing in this space. Their primary testing goes through Vanguard, and then a second sample is sent to Eagle Analytical, a company that works directly with compounding pharmacies and holds ISO certification.
I spoke with the owner personally. He will not sell a single product without it passing every one of these tests. His words: he dumps more products than he keeps because they don’t clear the sterility screen. Think about what that means for the products that do make it out the door.
More posts are coming that go deeper on what all of this means in practice. I’ll also be doing a dedicated post on why bioburdens testing is not the same as sterility testing — that distinction matters more than most people realize, and it’ll make a lot more sense once we walk through it.
A note on their blends
I want to highlight some of their formulations, because I haven’t seen anything like this before in the research space. Full unboxing below of a few I got my hands on:
Thymosin Alpha 1 + Thymulin — 10mg + 10mg (20mg total)
BPC-157, TB-500 & Cartalax — 12mg + 12mg + 12mg (36mg total)
What to expect when shopping
Their catalog will frequently show out-of-stock items, and restocks take longer than most vendors. That’s a direct result of the testing process — every batch takes 14–18 days to clear before it can be sold. They’re spending over $2,000 in testing per batch, and for future batches they’re sending in up to 20 vials for sterility testing alone.
That’s not a vendor cutting corners to move product fast. That’s a vendor that’s built their entire operation around getting it right.
Code DEREK is live at Peptidology for 15% off.
https://peptidology.co/?ref=mxxyvdne [ https://substack.com/redirect/b72091c4-70de-4754-89b9-65285477860e?j=eyJ1IjoiNGl3b2U2In0.sVDxRtmZ85v8kfdamY0krRXGMy3p768BWtuZifRB-Zs ]
Peptidology exemplifies exactly what the price tool was built to highlight — vendors who invest in transparency and accountability, not just the ones with the lowest price. There will be more posts on this company because there is genuinely a lot more to cover.
All products are for research use only, not for human consumption. Compare prices at peptideprice.store [ https://substack.com/redirect/60762d03-eebf-4a7e-b154-d1e0fc1ed9e6?j=eyJ1IjoiNGl3b2U2In0.sVDxRtmZ85v8kfdamY0krRXGMy3p768BWtuZifRB-Zs ].

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