Inside Peptides

Building FS Peptides. Manufacturing, testing and the business behind the vials. Notes from China.

[Inside Peptides @InsidePeptides]

@pepfanatics Batch 041 is carrying four marketing departments.

[Inside Peptides @InsidePeptides]

A sample can be sterile and still contain endotoxin. Routine steam sterilization can kill bacteria while leaving these Gram-negative bacterial components behind. A sterility test doesn’t measure endotoxin.

https://t.co/BTh1cMW3dv

[Inside Peptides @InsidePeptides]

CBL-514 is designed to trigger apoptosis: programmed death of fat cells.

The proposed pathway starts with inhibiting DYRK1B. That shifts the balance toward Bax, which promotes cell death, and away from Bcl-2, which supports survival. Caspase-3 then helps dismantle the cell.

https://t.co/vW0dtA1210

[Inside Peptides @InsidePeptides]

@oasishealthapp The photo shows a 15 mg/dose pen; the results graphic says 2.5 mg. For the 2.5 mg version, 10.27 mg per 2.4 mL corresponds to 102.7% of label claim.

[Inside Peptides @InsidePeptides]

Take two 10 mg powder samples, both 99% HPLC purity.

Using Bachem’s calculation, 80% net peptide content gives ~7.92 mg of target peptide; 90% gives ~8.91 mg.

Water and counterions add weight without appearing in that purity percentage.

https://t.co/4a95h3dQSc

[Inside Peptides @InsidePeptides]

Who wants Dragon Ball Z vial labels?

[Inside Peptides @InsidePeptides]

@Krysia830073 Asking for 27 mg to be rounded to 30.5 mg is giving the calculator a manufacturing job.

[Inside Peptides @InsidePeptides]

@JoshInProgress Would be useful to separate the lab bill from rejected stock and changes at the factory when discussing the price increase.

[Inside Peptides @InsidePeptides]

Josh’s 10 reported results span 108.6–138.6% of label claim. A one-vial result could have made this order look very different, depending on which vial was picked.

[Josh @JoshInProgress]

I know someone asked for the raw assay values that went into content uniformity:

132.16%
133.22%
108.60%
132.23%
134.40%
134.58%
134.61%
138.63%
135.30%
132.33%

Based on this data, the 108 looks like a special cause (although not that special since the vial used for the assay result was 107%)

[Inside Peptides @InsidePeptides]

@PeptideBriefs I’d add who selected the sample and how many vials they took it from.

[Inside Peptides @InsidePeptides]

Trying to get quantities locked before we send samples for testing. Otherwise you can get the report back and find there isn’t enough stock left from that batch.

[Inside Peptides @InsidePeptides]

@PioneerPeptides @researchitgg Do you have a redacted example of how you’d show the unidentified peaks on a report? Would be useful to see what the buyer actually gets.

[Inside Peptides @InsidePeptides]

Same 3 mL vial. Completely different job getting there.
BPC-157 is a relatively short synthetic peptide. GHK-Cu adds metal complexation. Semaglutide, tirzepatide and retatrutide bring longer sequences, modifications and more demanding purification. HGH isn’t even made the same way. it’s a recombinant protein.

[Inside Peptides @InsidePeptides]

@PioneerPeptides @researchitgg Are you using MS to identify the smaller peaks too, or just to confirm the main one?

[Inside Peptides @InsidePeptides]

@JoshInProgress Will you publish how the samples were selected too? Number of vials and whether they came from the same lot would be useful to see.

[Inside Peptides @InsidePeptides]

I’ve spent an unreasonable amount of time clarifying what someone means by “pen”. Empty device, filled cartridge, dual chamber, liquid, disposable/reusable. We’ve discussed prices before realizing we were talking about different products.

[Inside Peptides @InsidePeptides]

@NazhYaz Please join our community on TG.

https://t.co/0s4laEEPZl

[Inside Peptides @InsidePeptides]

CBL-514 is crazy

Phase 2b: ~20% mean reduction in abdominal fat volume by MRI, and 76.7% of treated patients improved by at least one clinical grade vs 18.9% placebo. Most responders saw improvement after only 1–2 treatments.

We’ve got CBL-514 in stock now.

[Inside Peptides @InsidePeptides]

@Krysia830073 Odd as we’ve been shipping to SA a lot more lately

[Inside Peptides @InsidePeptides]

We’re doing more private-label pen projects now: custom branding, packaging, batch coding and testing, all handled from the factory side.

[Inside Peptides @InsidePeptides]

@grok in 24 hours, choose a random person from my followers to receive a free kit of GHK-cu