Frequently asked questions

Orders are processed and shipped within 10–12 business days. Tracking information is provided after the order has shipped, and every shipment leaves directly from our United States facility in southern Virginia.

No. We ship within the United States only. Orders using an international delivery address, freight forwarder, or reshipping service cannot be accepted and will be refunded.

Flat-rate shipping is $5.99 and it is free on orders over $200. The cart shows a progress bar so you can see exactly how far you are from free shipping.

Yes. All inventory is warehoused and dispatched domestically from southern Virginia — no drop-shipping from overseas and no customs delays.

Vials ship in opaque, unbranded outer packaging with protective inserts. Nothing on the exterior identifies the contents or compound names.

If a package is lost, delayed beyond 30 days, or arrives damaged, we reship at no cost. Contact support with your order number and photographs of the packaging.

No. Because these are research chemicals whose chain of custody cannot be verified once they leave our facility, all sales are final and no returns are accepted. Damaged or lost shipments are handled under the reshipment policy.

Sign in and open your researcher portal, or use the order lookup page with your order number and email. A tracking link is emailed as soon as the label is scanned.

Yes. Every production lot is submitted to Janoshik Analytical for independent HPLC purity and mass-spectrometry identity confirmation. Reports are published on the certificates page.

We release material at ≥99% HPLC purity for the majority of compounds, with the exact figure for each lot printed on its certificate of analysis. If a lot fails the threshold, it is not released for sale.

Open the certificates page to view or download any published report as a PDF, or open the COA section on the individual product page. Digital reports are available on request; printed copies are not shipped with orders.

It shows the analysis date, sample identity confirmed by mass spectrometry, HPLC purity percentage, chromatogram, and the measured peptide content per vial so you can verify the label claim.

That compound's current lot report has not been published to the public library yet. Contact support with the compound name and we will send the analytical package directly.

Purity is the percentage of the peptide relative to all detected species by HPLC. Peptide content (net peptide) is the actual mass of active peptide in the vial after accounting for water and counter-ions.

Keep lyophilized material at -20°C, protected from light. Once reconstituted with bacteriostatic water, store at 2–8°C and use within the window listed on the product datasheet.

No. Lyophilized peptides are stable at ambient temperature for several weeks, which is why they are shipped dry. Transfer to a freezer once received.

Add bacteriostatic or sterile water slowly down the inside wall of the vial, never directly onto the powder. Swirl gently until dissolved — do not shake, which can shear the peptide chain.

Most reconstituted peptides remain stable for 21–28 days at 2–8°C. Compound-specific windows are listed in the storage section of each product monograph.

Repeated freeze-thaw cycles degrade peptides. If long-term storage is required, aliquot the solution into single-use vials before freezing at -20°C or below.

Lyophilized peptide at 2–10 mg forms a thin, near-transparent film or a small puck at the base of the vial. That appearance is normal; verify content against the certificate of analysis.

LOT identifies the production batch tied to its certificate of analysis, and EXP is the recommended re-test date for the lyophilized powder under proper storage.

The DAC (Drug Affinity Complex) variant binds albumin, extending half-life to roughly 6–8 days in published research models. The non-DAC form (Mod GRF 1-29) has a half-life measured in minutes and is used in pulsatile study designs.

A stack is a curated multi-compound set — such as recovery, longevity, or weight-management panels — supplied together at a bundled price for comparative or multi-arm study designs.

Strength selection depends on your protocol's concentration and study duration. Each product page lists molecular weight, vial content, and typical reconstitution volumes so you can calculate concentration precisely.

Yes. Tiered discounts of 5–20% apply automatically in the cart as quantity increases, and stacks are priced below the sum of their individual vials.

New lots are released continuously as analytical results clear. Create an account to save compounds to your wishlist and see new arrivals as they publish.

No. All compounds are sold strictly for in vitro laboratory research and are not for human or veterinary consumption, diagnostic, or therapeutic use.

Purchasers must be 18 years or older and must be qualified researchers or institutions acquiring material for legitimate laboratory work. Age verification is required before browsing.

No. We publish molecular data, mechanism-of-action summaries, and published literature references, but we cannot advise on administration because these compounds are not for human use.

A license is not required for the research compounds we list, but you remain responsible for complying with all federal, state, and institutional regulations governing their possession and use.

Checkout is handled by Stripe and accepts all major credit and debit cards plus Cash App Pay. Card details never touch our servers.

Nothing on your statement or invoice identifies the products purchased.

Yes. Payment is processed on Stripe's PCI-DSS Level 1 hosted checkout over TLS. We never store card numbers.

No, guest checkout is available. An account lets you track orders, save compounds, store addresses, and keep a record of every certificate you have downloaded.

Use the contact form for a routed response, or start a live chat during business hours. Most inquiries are answered within one business day.

It is an area-percent figure from a reverse-phase HPLC chromatogram: the area under the primary peak divided by the total integrated area, at a stated detection wavelength. It measures chromatographic purity relative to what the method can resolve — it is not a mass balance, and it does not account for counter-ion content, residual solvent, or water.

Because integration windows and detection wavelengths change the number. A peptide reported at 99% by an unnamed method tells you nothing about what was integrated or excluded. Every PrimeGen certificate names the laboratory, the method, and the integration conditions behind the figure.

Identity. HPLC tells you how much of one thing is present; mass spectrometry tells you whether that thing is the sequence it should be. An observed mass matching the theoretical molecular weight within instrument tolerance is the evidence that the correct peptide was synthesised.

Peptides commonly ship as acetate or trifluoroacetate salts, and adduct or charge-state assignment shifts the observed value. A small, explainable offset is normal; an unexplained offset of a full residue mass is not.

Peptide content is the fraction of the vial mass that is peptide rather than counter-ion, water, or residual salt. A vial can be 99% pure by HPLC and still contain meaningfully less peptide by mass than the label weight — which is why gravimetric concentration calculations should account for it in quantitative work.

Independent testing is performed per release. Certificates are tied to the lot they describe, and archived reports for previous release windows are available digitally on request.

Yes. Each published certificate carries the issuing laboratory's report reference, and the certificates page links out to the laboratory's own verification portal where one is offered.

Because a new release window is with the independent laboratory and the report has not returned. We mark those compounds explicitly rather than displaying an older lot's data as if it were current.

Bacteriostatic water is the common default for multi-draw laboratory work because the benzyl alcohol suppresses microbial growth across repeated punctures; sterile water is used where a preservative would interfere with the endpoint. Lipophilic constructs may need a small co-solvent volume first, followed by aqueous dilution.

Because DMSO, acetic acid, or any other co-solvent has biological activity of its own at non-trivial concentrations. A vehicle-only arm at the identical final co-solvent concentration is the only way to separate compound effect from solvent effect.

Far less stable than the lyophilized powder. Reconstituted material is typically refrigerated at 2–8 °C and used within a short working window; repeated freeze-thaw cycles are avoided by aliquoting at the point of reconstitution. Photosensitive sequences additionally need amber or foil-protected storage.

Yes. A binding assay reading a single receptor endpoint tolerates a different impurity profile than a proteomics workflow where a co-eluting species can be misassigned. Match the purity specification to the sensitivity of the readout rather than defaulting to the highest number available.

The copper ion is part of the active species in GHK-Cu, not an additive. Chelators such as EDTA strip it and leave the free tripeptide — chemically a different molecule that will not behave as the copper complex in matrix-biology models.

They are released as research-grade material and are not manufactured as sterile pharmaceutical preparations. Where an endotoxin result is available for a lot it appears on that lot's certificate; absence of a result should be read as not tested rather than as a pass.

Custom sequences and bulk quantities are handled directly by our team. Send the sequence, the scale, and the analytical documentation your institution requires through the contact page.