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They're typically running in-vivo metabolic studies or helping someone else set up long-term GLP-1 agonism assays, which means the powder needs to hold its stability across several freeze-thaw cycles ideally—so we do all our custom vial sizes and concentration adjustments (0.25mg up to 5mg per vial depending on your lab's protocol) to save you from relabeling everything yourself on-site. We've shipped batches where the end user filled the vials with sterile water, aliquoted into 100µL tubes, and stored at -20°C for about 8 months without noticeable drop-off per their own in-house HPLC checks.
The white powder itself is >98% pure per each COA we batch-test, and the molar mass comes in at 4113.57 g/mol—it's a big peptide so solubility data isn't one-size-fits-all, but our company can pull the specific solvent compatibility sheet when you're ready to order. Storage is straightforward: keep it dry, dark, and in the fridge at 0-4°C for short runs or pop it at -20°C for anything over a couple months. Most buyers go with the 5mL vial size even if they're only using 1mg per run, because it's easier to handle with a slimmer peptide loss on reconstitution.
And basically, we do custom labeling if you need GLP-1 product codes or a specific concentration printed on the side—not everyone wants to write on the vial with a marker. For bulk synthesis orders (10 grams or more) we can tighten the tolerance to 99% purity if needed, though 98% is already better than reagent grade for most in-vivo protocols, so it's not a requirement for everyone.
We usually have stock on the standard 10mg vials, but confirm lead time for custom peptide sequences or non-standdard packaging like 500mL drums that they sometimes want for large-scale screening work. It takes about 20 working days or so for custom runs, though the semaglutide powder itself is produced in batches of 5kg or so weekly—so we've never run a backorder on base matrial in three years, unless the plant shuts down for maintenance.
One detail that buyers don't always think to ask about: the peptide is hygroscopic after opening the sealed foil pouch, so we include a desiccant sachet in every shipment and recommend you re-dry the powder under vacuum at 25°C for 15 minutes before making stock solutions if the humidity is above 60% in your lab. It's a small step, but it in dose-response assays by roughly 15% based on data we've collected from previous custoemr feedback.
The HS tariff code is 2934.99.9001 if you're dealing with customs clearance, and our company provide a full SDS with every order—actually, we also send a method development suggestion for HPLC analysis base on the batch-specific purity results we generate, so you don't have to reinvent the dissolution solvent gradient from scratch. It's not suited for anything involving cell-free synthesis or bacterial expression systems where you'd need custom codons, though; this is purely for mammalian receptor work or in-vivo metabolic phenotyping.
