BPC-157 with bacteriostatic water: two items, two batches

This listing pairs a 5 mg vial of BPC-157 lyophilisate with a 10 ml vial of bacteriostatic water. They are two separately manufactured items with two separate batch numbers and two entirely different kinds of analysis behind them. A pack is not a material, so there is no such thing as a certificate for the pack.

Why a pack cannot have a certificate

A certificate of analysis is a laboratory's record of what it found in one batch of one material, on one date, by named methods. It belongs to that batch and to nothing else. Put two materials in one box and you have two batches, two records and two labels - not a combined document. Any seller offering a single certificate covering a peptide and its solvent has produced a marketing artefact, and it is worth noticing, because the same instinct that merges two certificates is the instinct that reuses one certificate across every vial of a product.

So the questions here are the two sets of questions, asked separately.

The peptide: BPC-157

A synthetic pentadecapeptide, sequence GEPPPGKPADDAGLV, CAS 137525-51-0, formula C₆₂H₉₈N₁₆O₂₂, calculated mass 1419.53 g/mol, listed publicly as PubChem CID 9941957. It contains no cysteine and so carries no disulfide bridges. It has no marketing authorisation in the United Kingdom or the European Union and does not appear in the EMA medicines database; in the UK, regulation 46 of the Human Medicines Regulations 2012 prohibits selling, supplying or offering an unauthorised medicinal product, and regulation 2 defines such a product by presentation as well as by function. The BPC-157 page sets out the identity, the nomenclature and the full pre-purchase checklist.

The analysis that applies to it is peptide analysis: purity by HPLC with the impurity peaks listed, the measured mass beside the theoretical 1419.53 g/mol, peptide content stated separately from purity, water by Karl Fischer titration, the method, the date, the batch number and a laboratory report number that can be checked away from the seller.

The solvent: bacteriostatic water

Water with 0.9% benzyl alcohol as a preservative - a well-characterised small molecule, C₇H₈O, 108.14 g/mol, PubChem CID 244. The preservative inhibits bacterial multiplication, which is what makes a multiple-entry vial workable. It does not sterilise, and it is not a pharmacopoeial grade of water.

None of the peptide analyses apply to it. A solvent has no chromatogram, no peptide content and no theoretical mass to check a measurement against. What applies instead is sterility, bacterial endotoxins, identification and content of the preservative, pH and container closure integrity. The bacteriostatic water page goes through that in full.

Purity and peptide content, since only one item has them

Purity by HPLC is a ratio - the share of separated peak area belonging to the target sequence. Peptide content is a quantity - the share of the vial's mass that is peptide at all, the balance being residual water and counter-ions left from synthesis, usually acetate or trifluoroacetate. Neither can be calculated from the other, and both belong to the peptide vial alone. The purity and peptide content guide explains the difference, and the certificate guide reads a full document line by line.

Reconstitution is arithmetic

The volume of solvent chosen is what sets the concentration of the resulting solution: 5 mg made up to 2.5 ml gives 2 mg/ml, and the same 5 mg made up to 5 ml gives 1 mg/ml. The peptide calculator converts between vial content, solvent volume and concentration in both directions. It recommends no quantity for any purpose, and neither does this page. The reconstitution and storage guide covers handling.

"Research use only" is a purpose, not a permission

The phrase records the seller's intended purpose - laboratory work, not use in people. It is not a category in UK or EU law, not a licence, and not a review by any authority. It is not a quality claim about either item in this pack.

What Peptorium publishes about these items

This page publishes identity for both items: what each one is, and where the identity data for the peptide is set out. The two are manufactured separately and carry two batch numbers. Purity, peptide content and water for the peptide, and sterility, endotoxins and preservative content for the solvent, describe single batches rather than products. Those results belong on documentation issued by the laboratories that tested those batches, and they travel with the materials themselves.

What to ask before buying a pack

• Are there two batch numbers, printed on the two labels?
• Is there a separate certificate for the peptide batch, with mass, impurity peaks, peptide content, water, method and date?
• Is there separate documentation for the solvent - sterility, endotoxins, preservative content, pH?
• Is anyone offering one document covering both? That is a document about a box, not about a material.
• Can either result be checked with the laboratory that produced it?

What is not known

• What either vial contains cannot be known without analysing it.
• Storage guidance for the lyophilisate is handling convention; the 28-day in-use period for a preserved solvent vial is convention for that class of product. Neither is a measurement on a particular lot.

Frequently asked questions

Both items are supplied for laboratory and in vitro research use: neither is a medicine, a food supplement or a medical device, and nothing here is a recommendation to use either in humans or animals. See the research declaration, and the BPC-157 page for the identity and nomenclature of the peptide in full.