Quick take
Improved Peptides, run by Improved Company LLC of Oklahoma City, posts lot-numbered certificates with test dates and HPLC purity for 14 of its 22 products. The library names no testing lab, three products share one lot code, and product pages use research-area labels that fall short of strict research-use wording. Shipping terms are clear, but sales are final apart from damage claims and Zelle is the only payment method shown.
The seven checks
| Independent lab testing | Partly | Independent third-party testing is claimed, but the COA library names no lab. |
|---|---|---|
| Batch-specific COAs | Partly | Fourteen products have lot-numbered, dated certificates; eight are still marked in verification, and three products share one lot code. |
| Identity confirmed by mass spec | Partly | The site says identity is confirmed by mass spec, but the library shows only HPLC purity figures and the report file could not be read as text. |
| Research-use labeling | Partly | Clear research-use-only notices appear, but product categories and descriptions use research-area labels that point to what each compound is studied for. |
| Age and use confirmation | Partly | A 21+ requirement and research-use representations appear in the terms, with no age or research check at checkout. |
| Clear shipping and refund terms | Yes | Shipping, FAQ and returns pages give the cut-off time, carrier, transit times and a 14-day claim process. |
| Business transparency | Yes | Improved Company LLC gives an Oklahoma City address in its terms, a support email with hours and Oklahoma-law terms of sale. |
Improved Peptides is run by Improved Company LLC, which gives an address in Oklahoma City in its terms of service. Its original improvedpeptides.com address now redirects to improvedusa.com, where the store sells freeze-dried research peptides in single vials to US buyers.
The site is short and direct: a catalog of about 22 products, a COA library, an FAQ, and separate shipping, returns and research-use pages. Guest checkout is allowed, so no account is needed to order.
What Improved Peptides sells
The catalog covers about 22 products, each sold as a 5 mg or 10 mg vial. Examples include BPC-157, TB-500, Tesamorelin, DSIP, KPV, GHK-Cu, MOTS-c, NAD+, a CJC-1295 and Ipamorelin blend, and GLP-1 class compounds sold under codes such as GLP-1S and GLP-3R. Prices seen run from about $45 to $99 per vial, and an insulated cooler is sold as an add-on.
Product pages carry research-use notices and storage notes but no usage directions. They do, however, group items under research-area categories with short descriptions of what a compound is studied for, which falls short of strict research-use labeling.
COA library: lot numbers but no named lab
The COA library lists 22 products. Fourteen have a posted certificate with a lot number such as IP-BPC-2026-001, a test date between April and September 2026 and an HPLC purity figure from 99.0% to above 99.9%. The other eight, including DSIP, Selank, Semax and Tesamorelin, are marked as in verification, and buyers are asked to request them by email.
Points to note:
- No lab is named anywhere in the library; each entry says only that it was third-party tested.
- The FAQ says identity is confirmed by mass spec, but no mass results appear in the page text, and the posted report file reviewed could not be read as text.
- Three different products share a single lot code, which buyers should raise with support.
The FAQ says each certificate shows the lot, test date and lab, so the report itself should name the lab. Match the lot printed on your vial to its certificate before relying on it.
Labeling and purchase checks
Every page states that products are for laboratory research only, not for human or veterinary use, and not for diagnostic or therapeutic purposes. A separate research-use page and an FDA disclaimer repeat this. The terms require buyers to be 21 or older and to represent that they are qualified researchers.
Those checks sit only in the terms. No age gate or research-use checkbox appeared on the site or next to the add-to-cart button, and guest checkout means there is no account step either.
Shipping, payment and claims
Orders placed by 4 PM Central on weekdays ship the same business day from a US facility by USPS Priority Mail, with tracking and plain packaging. Standard delivery takes 2 to 4 business days after shipping and is free on US orders, while two-day shipping is free over $200. P.O. boxes and military addresses are accepted, and international shipping is not currently offered.
Zelle is the only payment method shown, and the terms say Zelle and crypto payments are final once confirmed. Returns are limited:
- All sales are final, and opened items cannot be returned.
- Damaged, wrong or defective items must be reported within 14 days of delivery with photos, including the lot label.
- Claims are reviewed within 2 business days, and approved claims get a replacement or store credit; cash refunds are rare.
Support is by email, weekdays 9 AM to 5 PM Central, with a stated reply within 24 hours.
Verdict: who Improved Peptides suits
Improved Peptides suits US labs that want fast domestic dispatch and a short catalog with posted lot numbers. Its paperwork has clear gaps: no named lab in the library, missing reports for eight products and no visible mass spec results.
- Ask which lab issued the report for your lot and confirm it with that lab.
- Request certificates for products still marked in verification before ordering them.
- Photograph the parcel and lot label on arrival, since claims close after 14 days.
Catalog examples
A sample of listed research products and sizes when we checked. Prices change often; the supplier's site is the source of truth.
| Product | Size | Listed price |
|---|---|---|
| BPC-157 | 10 mg vial | about $65 |
| TB-500 | 10 mg vial | about $69 |
| Tesamorelin | 10 mg vial | about $89 |
| DSIP | 5 mg vial | about $45 |
| GLP-1S | 10 mg vial | about $89 |
What holds up
- Lot numbers, test dates and HPLC purity listed for 14 products in a public library
- Same-day dispatch before 4 PM Central and free USPS Priority Mail on US orders
- Written claim process for damaged or wrong items, with a 2-business-day review
- Registered LLC with a street address and Oklahoma-law terms
What to watch
- The testing lab is not named, and eight products have no posted certificate yet
- Product categories and descriptions use research-area labels rather than plain research-use wording
- Zelle is the only payment method shown, and cash refunds are rare and discretionary
Questions
Is Improved Peptides legit?
Improved Company LLC lists an Oklahoma City address, posts lot-numbered certificates for 14 products and publishes clear shipping and claim terms, but it does not name its testing lab. No outside reviewer can vouch for a single order, so match the lot number on your vial to its certificate and confirm that report with the lab that issued it.
Does Improved Peptides publish COAs?
Yes. The COA library lists lot numbers, test dates and HPLC purity for 14 products, while eight more are marked in verification and can be requested by email.
How does Improved Peptides ship?
Orders placed by 4 PM Central on weekdays ship the same day by USPS Priority Mail from a US facility. Standard shipping is free on US orders, and international orders are not currently accepted.
What is the Improved Peptides refund policy?
All sales are final. Damaged, wrong or defective items reported with photos within 14 days of delivery are replaced or credited, and refunds to the original payment method are rare.
For laboratory research only. This file reviews a supplier's testing, paperwork and policies. It is not a recommendation to use any product in people or animals, and it contains no dosing or medical advice.
Compare with
| Supplier | Score | Independent testing | Batch COAs | Identity by mass spec | Ships from | Supplier file |
|---|---|---|---|---|---|---|
| Core Peptidescorepeptides.com | 3.5/5 | Yes | Partly | No | United States | Read file |
| Instant Peptidesinstantpeptides.com | 3.5/5 | Partly | Yes | Partly | United States | Read file |
| Longevity Peptideslongevitypeptides.us | 3.5/5 | Partly | Yes | No | United States | Read file |