Factory Supply TB-500 Peptide Powder 99% Purity | Thymosin Beta 4 CAS 885340-08-9

We've been through a lot of batches with this one, and what keeps buyers coming back is the fact that every single run gets put through HPLC and mass spec before it leaves—we don't skip a step. It's always over 99% as a white powder, and truthfully, most researchers we deal with don't even quibble about the purity at that level.

Basically, the batch consistency speaks for itself when you have the COAs from the last few months side by side, and those show the CAS 885340-08-9 structure holding tight. You'll see the molecular weight hits 842.96 g/mol every time within a tight tolerance, better than reagent grade for this particualr peptide. Do remember that if you're slamming a bulk order, we usually have stock, but confirm lead time.

The key there is the retest policy—if you hold it past 6 months or so at 2-8°C, it's worth sending a sample back for a check, humidity destroys this stuff faster than most think. We don't automatically spin that as a positive; it's just reality for storage. One concrete thing we've noticed is that the powder clumps slightly faster if vial isn't resealed immediately after reconstitution.

It's not suited for in vivo work without proper formulation, really, and we flag that because of that it's a specific use case some buyers miss. Also, 5mg or 10mg per vial depending on your batch preference is standerd, but we've seen larger labs go with the 2mg vials for precise dosing control.

So for shiping, we typically default to 10 vials per kit packed with desiccant, and you'll want to store them in a dark place—moisture is the enemy here, not just heat. A 3-5 word sentence: It handles well.

And anyway, most buyers go with teh 10mg vials for their protocols because the packaging minimizes waste, but check your own handling SOP first. The MOQ varies, but smaller quantities are usually ready to go from the shelf.