Shipping Policy

Last updated · 2026-05-03 · Version 2026-05-03-v1

This Shipping Policy describes how US Precision Peptides ("USPP," "we," "us," or "our") packages, dispatches, and delivers products ordered through usprecisionpeptides.com (the "Site"). It is incorporated by reference into the Terms of Sale and applies to every order.

1. How We Ship

We ship lyophilized (freeze-dried) peptides from our U.S. fulfillment in sealed glass vials, packed for safe transit and dispatched at ambient temperature.

We do not use insulated mailers, ice packs, or refrigerated transit. The science is straightforward: a freeze-dried peptide cake in a sealed vial is stable at room temperature for days to weeks because the degradation pathways that affect peptides require water, and a properly lyophilized product contains almost none. The protection lives in the vial, not in the packaging around it.

What this means in practice: you take responsibility for storage the moment your shipment arrives. We tell you exactly what to do at the door, and we hold ourselves to a tight dispatch standard so the transit window stays short.

2. Dispatch Standard

We publish the cutoff because we honor it. If something on our end delays a specific lot — a quality check that runs long, a packaging issue — we contact you before the cutoff window closes. We don't quietly roll your order to the next day and hope you don't notice.

2.1 Choosing a carrier at checkout

The same packaging is used for both options. Your choice is about transit speed and tracking, not about how the product is packed.

3. Why We Ship Ambient

Freeze-drying removes water from the peptide under vacuum. What's left is a dry porous cake with residual moisture below about 3%. Without water in the vial, the two main ways peptides break down — hydrolysis (water-driven bond breaking) and aggregation — are effectively halted. The molecule is stable in that dry state across normal transit windows.

The other half of the story is the vial itself. Our peptides ship in glass vials with crimped aluminum seals over butyl rubber stoppers. That seal is hermetic — air-tight and moisture-tight. As long as the seal is intact, the dry environment inside the vial stays dry, regardless of what the air around the package is doing.

This is also why insulated mailers and ice packs don't actually add scientific value for a freeze-dried peptide. Insulation slows temperature changes around the package, but the relevant question for the molecule isn't the air temperature outside the vial — it's whether moisture can reach the peptide inside the vial. The seal handles that, and the seal does its job whether the box around it is insulated or not. This is consistent with how the major research peptide manufacturers (Bachem, GenScript, Sigma-Aldrich) ship: ambient, in sealed vials, with no ice pack as default.

What the freeze-dried peptide is not protected against:

• Sustained heat above roughly 40°C / 104°F. A package sitting in a hot mailbox or on a sunlit porch through a Texas summer afternoon is in a different category than a package on a sorting truck for two days. If you live in a hot-climate area during summer months, FedEx 2Day to a known-recipient address is the right call.
• A broken seal or cracked vial. This is rare, but it's why we tell you to inspect every vial before storing it.
• Storage at room temperature after the shipment arrives. This is the part we cannot do for you. See the next section.

4. What To Do When Your Order Arrives

1. Inspect the vial. Confirm the lot number printed on the vial matches the lot number on the COA you can download from the product page or the COA library.
2. Move the vial to a freezer at −20°C (or colder). Freeze-dried peptides should go into freezer storage as soon as your shipment is opened. This is the storage condition that supports the long shelf life shown on the COA.
3. Don't reconstitute (mix with liquid) until you're ready to use it. Once the peptide is in solution, it has a much shorter shelf life than the dry cake. See the table below.
4. Save the COA. Or bookmark the lot's URL on our site. The lot number on your vial should always trace back to a real document on our site — that's the chain of records that makes the product verifiable, and it only works if you keep the receipt.

If a vial arrives with visible damage — a broken seal, cracked glass, or a cake that's slid loose into the stopper — email us at support@usprecisionpeptides.com with your order reference and we'll replace it from the same lot. Photograph the vial before throwing it out.

5. Reconstituted Shelf-Life Reference

These are typical numbers for a freeze-dried peptide that has been mixed with bacteriostatic water and stored cold. Specific stability depends on the peptide; the COA for each lot is the authoritative reference. Treat this as a working guide, not a guarantee.

A few peptides — particularly those with disulfide bonds or copper-conjugated structures — can be noticeably less stable than the typical numbers above. The COA for the specific lot is always the better reference.

6. What's In The Box

Every shipment includes:

• The vial(s) you ordered, packaged to protect against impact during transit
• A packing slip with your order reference, the lot numbers shipped, and a link to each lot's COA
• A short reference card with the storage and handling guidance from this page

We don't include promotional material, samples, or unrelated marketing in our shipments.

7. What We Don't Do

• We don't offer refrigerated, ice-pack, or temperature-controlled transit. Freeze-dried peptides don't require it; the protection is in the dry state of the molecule and the vial seal, and post-arrival freezer storage is what carries the long-term shelf life.
• We don't pre-check shipping insurance, package protection, or any other add-on at checkout. If you want it, you opt in. We don't help ourselves to your money on the way to the order button.
• We don't claim "the temperature during transit doesn't matter." It matters in extreme cases (sustained heat above ~40°C), and we're honest about where the limits are.
• We don't promise dispatch speeds we can't actually meet for the lot you're ordering.
• We don't ship internationally at this time.

8. Returns, Refunds, and Replacements

Because these are research-use materials, we can't accept returns the way a typical consumer product can be returned. Once a vial leaves our facility, we have no way to verify it was handled correctly before it comes back, which means we can't put it back in inventory.

What we will replace, free of charge, with proof of the order and a photograph where applicable:

• Vials damaged during transit (broken seal, cracked glass, dislodged cake)
• Lots that arrive with a COA mismatch — meaning the lot number printed on the vial doesn't match a published COA on our site
• Shipments confirmed lost by the carrier

What we won't replace:

• Lots that were stored or reconstituted in a way that doesn't match the guidance on this page, where that's the likely cause of the problem
• Orders the buyer changed their mind about after dispatch — please confirm the SKU, format, and lot before placing the order
• Heat damage from a package left unattended at the destination for an extended period in hot weather (this is what FedEx 2Day with a known recipient is designed to prevent)

To request a replacement, email us at support@usprecisionpeptides.com with your order reference and any photos you have. We respond within one business day.

9. Compliance Note

All products are sold for in-vitro research use only. Not for human or veterinary use. This Shipping Policy doesn't change or override the Research Use Acknowledgement that applies to every order, nor the Terms of Sale into which it is incorporated.