Lyophilized vials or raw powder: which format to buy

It is written for procurement, not for the bench. It describes what each format physically is, how it is documented, how it is priced in words rather than figures, how it travels, and which buyers usually choose which. It does not describe what any compound does or how any material is used.

What each format physically is

Both formats start as the same lyophilized solid from the same production lot. The difference is whether that solid has been divided into vials at the factory or left as a bulk mass for the buyer to divide.

Lyophilized vials

A lyophilized vial is a small glass vial into which a measured solution of the peptide was filled, frozen and dried under vacuum, leaving a solid cake at the bottom. The vial is closed with a rubber stopper and an aluminium cap, and labelled with the product name, the fill in milligrams and the lot number. The fill is the mass of solid the vial was filled to; it is stated on the label and on the batch record for the lot.

Vials are supplied in kits of ten. A sample order is 1 kit (10 vials). The fills that exist differ by compound: BPC-157 exists at 2 mg, 5 mg, 10 mg and 20 mg; Semax at 5 mg and 10 mg; NAD+, which is a dinucleotide rather than a peptide but is supplied the same way, at 100 mg, 500 mg and 1000 mg. Each page on the compounds list states its fills.

Raw powder

Raw powder is the same lyophilized solid before it has been divided into vials: a weighed mass in a sealed container, labelled with the product, the weight and the lot number. It is quoted per gram from 5 g and dispatched cold-chain. The buyer receives one container per line rather than many small units, and does any further weighing or dividing in their own facility.

The powder is not a different grade. It is the same lot, documented by the same certificate. What differs is the unit: a vial is a finished unit with a stated fill; a container of powder is a bulk unit with a stated gross weight.

Who does the weighing

This is the whole distinction, so it deserves its own section. With vials, the manufacturer weighs. The fill is set at production, every vial in the kit carries the same fill, and the fill is stated on the label and the record. The buyer counts vials and never needs a balance.

With raw powder, the buyer weighs. The container arrives with a stated gross weight; everything after that, from dividing it into working quantities to recording what was taken and what remains, happens on the buyer's balance and in the buyer's records. That gives control and it gives responsibility. A laboratory with a calibrated balance and a weighing procedure is set up for it. A distributor shipping sealed units to other people usually is not, and would be taking on a step the manufacturer has already done.

The weight basis matters more for powder than for vials. A vial fill is a nominal mass of solid. A gram of powder is a gross weight that includes counter-ion and residual water unless the quotation says net. Ask which basis is quoted; the quotation comparison guide explains why it changes the arithmetic.

How each format is documented

Both formats are documented by the same batch record. One lot, one certificate, reporting HPLC chromatographic purity and an MS molecular-weight result with the manufacturing, test and retest dates. The records in the Pepti public COA library are listed per lot and per fill, each links to a PDF summary, and the batch table on each compound page mirrors them.

For vials, the quantity is documented by the fill stated on the vial label and on the record: the label says what the vial was filled to and the record says the same. For powder, the quantity is the gross weight on the container label and the dispatch note. In both cases the lot number on the label is the link to the certificate, and the guide to matching a certificate to a batch covers how to confirm that link on receipt.

What neither record reports is the same for both: sterility, endotoxin, water content, residual solvent and net peptide content are not on the public summaries. A buyer who needs those arranges them with an outside laboratory, and the lot number on the label is what ties that result to the material.

Unit economics in words

No prices appear on this site. The structure of the two quotations can still be described, and the structure is what decides which one fits.

Powder is quoted per gram from 5 g. The per-gram figure covers the material, the sealed container, the certificate and cold-chain packing. It does not cover weighing into working units, labelling those units or tracking them, because the buyer does those.

Vials are quoted per kit of ten at a stated fill. The per-kit figure covers the material, the filling and freeze-drying, the stopper and cap, the label, the kit packing and the certificate. The material cost per milligram is one part of that; the rest is the cost of turning bulk solid into ten sealed, labelled, tracked units.

So the comparison is not powder versus vials. It is powder plus your own fill-and-finish versus vials with the fill-and-finish already done. For a buyer who will divide the material anyway, powder is usually the better-structured quotation. For a buyer who wants sealed units to pass on, vials usually are, because the alternative is to build a filling step that the manufacturer already runs.

The order sizes that exist

• Sample order: 1 kit (10 vials) in one fill. The smallest unit that still carries a lot number and a record.
• Private-label OEM run: from 50 kits (500 vials), planned as a production batch under the buyer's own label, with label and carton details handled after the quotation.
• Raw powder: from 5 g, quoted per gram, dispatched cold-chain.
• Mixed orders: powder and vials on one quotation, described below.

Chain of custody per unit

Custody is where the formats diverge furthest. A vial is a sealed unit with its own label. It can be handed to another person, another laboratory or another company, and the lot number travels with it. If a question arises later, the vial, the label and the record can be put side by side without anyone having to piece together what happened between dispatch and that moment.

A container of powder is one sealed unit until the buyer opens it. From that point the custody record is the buyer's: who opened it, what was taken, what it was put into, what label that new container carries. A laboratory with a sample log handles this every day. A buyer without one has no record of what became of the material after the seal was broken, and no record is a problem on the day someone asks.

For a distributor this is usually decisive. Sealed vials with a stated fill and a lot number can be supplied onward as received. Powder cannot be supplied onward as received without the buyer becoming, in effect, a repacker, with the documentation that implies.

Storage and transit

Both formats ship as a lyophilized solid, kept cold and out of light. Raw powder orders are packed cold-chain for transit, and the quotation states this as included. Vial kits travel in their kit packing, and the quotation states the packing for the destination. On arrival both go into cold storage closed, and the retest date on the certificate goes into the inventory record.

The handling difference is repeated opening. A vial is opened once. A powder container is opened each time material is taken, and each opening is an exposure to warm, humid air. The storage and retest guide covers how to manage that; the short version is that powder suits a buyer who will divide it soon after receipt, and vials suit a buyer who will hold units for a long time and open them one at a time.

None of this is an instruction for use. It is the storage logic that applies to any lyophilized reference material held in a store.

How mixed orders work

A single enquiry can ask for both formats. A common pattern is a few grams of powder for method work plus one sample kit of a fill, so that the laboratory has both a bulk unit and a finished unit from the same manufacturer. Another is a distributor ordering vials in two fills plus powder of a different compound on the same quotation.

Each line is quoted on its own basis, powder per gram and vials per kit, and each line carries its own lot reference. Lines from the same lot share a certificate; lines from different lots or compounds have one each. The lead-time window for the order is set by the longest line: a sample kit typically 3–7 days, a production batch typically 10–14 days, and an OEM repeat batch typically 14–18 days, after specification and payment confirmation, with the quotation stating the window that applies.

Put both on one enquiry if you have not decided. Seeing the two lines side by side on one quotation is the quickest way to see how the per-gram and per-kit structures differ for the compound and quantity you actually need.

A decision table by buyer situation

None of these rows is a rule. Each is the format that usually fits, with the reason and with what to ask for on the enquiry, so you can see whether your situation matches.

Reading the table against your own situation

Many buyers fall into one row, but some fall into two. A laboratory that also supplies sealed units to collaborators is both the first row and the third, and usually ends up with a mixed order. A brand owner who has not yet qualified the supplier is the fourth row and the fifth, and usually starts with a sample kit before planning the run. The supplier qualification checklist covers that first step in detail.

What neither format tells you, and what Pepti publishes

Neither format tells you what the compound does, and no page on this site will. Neither format tells you sterility, endotoxin, water content or net peptide content; those are not on the public records and a buyer who needs them arranges them separately. Neither format tells you that a future lot will report the same purity as a past one; the records are results per lot, and the five public BPC-157 records reporting between 98.73% and 99.72% describe five lots, not a specification.

Material on this site is manufactured by Pepti in Guangzhou. Pepti publishes batch records in its own public COA library with an HPLC purity result and an MS molecular-weight result per lot, with manufacturing, test and retest dates, and each record links to a PDF summary. Quotations from this site name the lot where stock is allocated, so the record can be read before payment; the quality page describes the documentation and order photographs show how both formats are packed for dispatch.

No certificate or registration is claimed on this site. Choosing a format is a logistics and documentation decision, and this guide has kept to that.