BR
Bryce R.
3/28/2026
Consistent
Tirzepatide earned an A grade in independent testing. Paradigm delivers, every time.
P
Paradigm Peptide
Peptide Vendor. Lab-tested. Independently scored.
4.5
37 reviews · Great
- 9 HPLC samples across 2 products
- Catalog avg purity 92.5%
- www.paradigm-peptide.com/?ref=BORENHEALTH
- Independent testing, no pay-to-rank
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Lab testing results
Independent results across 2 products.
9
Total lab tests
92.5%
Avg purity
100.0%
Best score
68.0%
Worst score
Tested products
| Product | Grade | Tests | Avg | Range | Latest | Price | $/mg |
|---|---|---|---|---|---|---|---|
| Retatrutide | AGREAT | 6 | 96.0% | 76.0% – 100.0% | 9/4/2025 | $300.0030 mg vial · Updated 5 days ago | $10.00 / mg |
| Tirzepatide | AGREAT | 3 | 89.0% | 68.0% – 100.0% | 9/4/2025 | $149.0030 mg vial · Updated 4 days ago | $4.97 / mg |
Individual lab tests
Tirzepatide10.0
Date
9/4/2025
Purity
99.95%
Quantity
60mg → 62.800mg
Lab
Lab E
Retatrutide10.0
Date
9/4/2025
Purity
99.95%
Quantity
20mg → 20.400mg
Lab
Lab E
Retatrutide10.0
Date
9/4/2025
Purity
99.9%
Quantity
30mg → 30.400mg
Lab
Lab E
Retatrutide10.0
Date
8/11/2025
Purity
99.95%
Quantity
20mg → 20.100mg
Lab
Lab E
Retatrutide10.0
Date
8/11/2025
Purity
99.95%
Quantity
30mg → 30.500mg
Lab
Lab E
Tirzepatide10.0
Date
8/11/2025
Purity
99.95%
Quantity
30mg → 29.500mg
Lab
Lab E
Retatrutide10.0
Date
8/11/2025
Purity
99.92%
Quantity
50mg → 49.900mg
Lab
Lab E
| Product | Date | Score | Purity | Quantity | Lab |
|---|---|---|---|---|---|
| Tirzepatide | 9/4/2025 | 10.0 | 99.95% | 60mg → 62.800mg | Lab E |
| Retatrutide | 9/4/2025 | 10.0 | 99.95% | 20mg → 20.400mg | Lab E |
| Retatrutide | 9/4/2025 | 10.0 | 99.9% | 30mg → 30.400mg | Lab E |
| Retatrutide | 8/11/2025 | 10.0 | 99.95% | 20mg → 20.100mg | Lab E |
| Retatrutide | 8/11/2025 | 10.0 | 99.95% | 30mg → 30.500mg | Lab E |
| Tirzepatide | 8/11/2025 | 10.0 | 99.95% | 30mg → 29.500mg | Lab E |
| Retatrutide | 8/11/2025 | 10.0 | 99.92% | 50mg → 49.900mg | Lab E |
Review summary
Synthesized from reviews · AI
Based on 37 reviews, customers have shared their experiences with Paradigm Peptide. Reviewers overwhelmingly had positive experiences with this company, praising product quality and service.
What researchers are saying
CH
Caleb H.
3/2/2026
Solid
Tirzepatide from Paradigm has been consistent across two cycles. Vials packed well, shipping was quick. Earned an A grade in independent testing which is why it made my stack. Customer service answered fast when tracking glitched.
SH
Spencer Hassan
2/21/2026
solid COA match, minor variance
Ordered Retatrutide from Paradigm and ran it through the usual checks once it landed. Their published COA listed 99.2% purity by HPLC; my own third-party test came back at 98.7%, which is well within acceptable variance for a peptide at this molecular weight. Mass spec confirmed identity, no surprises there. Vials arrived double-bagged with a desiccant pack, lyophilized cake was intact and uniform across all five units (no fluffing or wall-cling). Reconstituted cleanly with bac water, no cloudiness at room temp after 20 minutes. Shipping took six days domestic which is slower than I'd like but tracking updated consistently. Pricing per mg is competitive without being suspiciously cheap, which I appreciate. Knocked off a point because their batch documentation only shows HPLC and not mass spec data on the public PDF — you have to email and request it. They did respond within a day when I asked, so it's a minor gripe. Will reorder for the next round of work. Consistency batch-to-batch is what matters most for my research and so far Paradigm is holding up.
JD
Jasper Driscoll
2/14/2026
Reliable
Tirzepatide arrived fast, COA matched. Reordering.
WA
Wesley Ahmadi
1/13/2026
First order went pretty well
Retatrutide tested at 100.0% purity. Shipping was fast. Confused by checkout but product delivered fine.
About Paradigm Peptide
Peptide VendorContact
All reviews
4.5
37 total
Top mentions
- Mar 28, 2026BR
Bryce R.
Sweden
Consistent
Tirzepatide earned an A grade in independent testing. Paradigm delivers, every time.
- Mar 2, 2026CH
Caleb H.
Italy
Solid
Tirzepatide from Paradigm has been consistent across two cycles. Vials packed well, shipping was quick. Earned an A grade in independent testing which is why it made my stack. Customer service answered fast when tracking glitched.
- Feb 21, 2026SH
Spencer Hassan
Netherlands
solid COA match, minor variance
Ordered Retatrutide from Paradigm and ran it through the usual checks once it landed. Their published COA listed 99.2% purity by HPLC; my own third-party test came back at 98.7%, which is well within acceptable variance for a peptide at this molecular weight. Mass spec confirmed identity, no surprises there. Vials arrived double-bagged with a desiccant pack, lyophilized cake was intact and uniform across all five units (no fluffing or wall-cling). Reconstituted cleanly with bac water, no cloudiness at room temp after 20 minutes. Shipping took six days domestic which is slower than I'd like but tracking updated consistently. Pricing per mg is competitive without being suspiciously cheap, which I appreciate. Knocked off a point because their batch documentation only shows HPLC and not mass spec data on the public PDF — you have to email and request it. They did respond within a day when I asked, so it's a minor gripe. Will reorder for the next round of work. Consistency batch-to-batch is what matters most for my research and so far Paradigm is holding up.
- Feb 14, 2026JD
Jasper Driscoll
Italy
Reliable
Tirzepatide arrived fast, COA matched. Reordering.
- Jan 13, 2026WA
Wesley Ahmadi
France
First order went pretty well
Retatrutide tested at 100.0% purity. Shipping was fast. Confused by checkout but product delivered fine.
- Jan 1, 2026JB
Jonas Bridger
Italy
consistent batches
Third order of reta. Same quality every time. That's why I keep coming back.
- Dec 24, 2025S
silas_85
United Kingdom
decent
Ordered the tirz from Paradigm after my usual source went sideways on QC. Vials looked clean, lyophilized properly, no weird residue. A-grade on the independent testing is what pushed me to try them. Shipping took about a week which is fine. Reconstituted normally for my work.
- Dec 14, 2025NC
Naomi Castellanos
United States
Really impressed
First order went smoothly. Tirzepatide arrived fast, well packaged. Will definitely reorder.
- Nov 29, 2025ID
Imani Dvorak
United Kingdom
protocol is finally dialed in
Been running Paradigm for about four months now and they've earned the spot in my rotation. Ordered tirzepatide for my current cycle and the COA matched what they advertised on site, tested at 100.0% purity. That kind of lab transparency is the main reason I keep coming back. Some vendors post a generic certificate from a year ago and call it good. Vials arrived double-boxed with cold packs even though it was lyo, which I appreciated. Reconstituted clean with bac water, no cloudiness, no weird floaters. Subjective response on my end has been consistent batch to batch, which matters more to me than a slightly cheaper price point somewhere else. Consistency is what makes a research log actually useful. Shipping took about five days from order confirmation. Customer service answered an email about tracking within a few hours. Not the cheapest option out there but the QC justifies it for my purposes. Will reorder.
- Nov 20, 2025EL
Esme L.
Italy
mixed bag this cycle
Ordered tirz from Paradigm to slot into my current protocol. Reconstitution was clean, peptide visually fine, no clumping. Shipping took longer than I'd like — almost two weeks — and one vial had a slightly crooked stopper that made me nervous. That said, what I dialed in seemed consistent batch to batch. Customer service replied but was vague. Probably reorder, probably shop around too.
Showing 1–10 of 37 reviews