Account
Inquiry
You've probably noticed that a lot of raw peptide supply is inconsistent, with impurities that can skew your baseline data or force you to re-run entire assays. That's the biggest headache we hear about, and it's exactly what we set out to solve with these 20mg vials. We're not talking about something that just looks pure on a label; we're talking about a consistent 99% purity by HPLC—that's a tighter tolerance than most resellers can guarantee, and it saves you time recalibrating for batch variation.
What that means in practice is that when you're working up a dose-response curve or running an ELISA, you're not fighting with unknown variables form the peptide itself. The CAS numbers are 2023788-19-2 for semaglutide and 910463-68-2 for tirzepatide—though we also sometimes see the old LY3298176 reference on the tirzepatide side—and the molecular weight sits at roughly 4813 g/mol. Basically, you're getting the exact molecule you ordered, every time, and we synthesize under controls that let us back that 99% figure with a COA on request.
Now, a detail that matters but nobody thinks to ask: the 20mg per vial is filled to a slight overage—about 5% or so—to account for any material lost during reconstitution or adherence to the glass. We don't advertise that, but it's something anyone handling this stuff regularly will appreciate. And if you're in a tight spot, we usually have stock, but confirm lead time because sometimes the EC number (200-001-8) batch runs get booked up for weeks, especially when labs are ordering in bulk.
One thing to keep in mind—this is research grade, not pharmaceutical, so it's not suited for anything clinical or in vivo work where you need USP-grade sterilization. The packging is a sealed vial, argon-flushed to minimize oxidation, and we ship it with an SDS if you request it. Most buyers go with the 20mg size for smaller studies—it's easier to handle than a 50mg drum, and you're not committing to a huge MOQ—but our company can do larger vials on a custom run if you're scaling up.
So if you're comparing costs, the per-milligram price on the 10mg vs 20mg vials works out cheaper at the 20mg level, obviously, but the 5L drum is easier to handle if you're setting up a continuous assay. We've had a few buyers try to use it for cell-based work, and it's fine—better than reagent grade for this—but just know the solvent compatibilty isn't guaranteed for every buffer system. Anyway, we've been shipping this product for years, and the main thing is the purity holds across batch numbers, which is what you really need.
