Research-use-only reference standards
Precision in every peptide.
Tested by USA-based, ISO/IEC 17025-accredited labs — research-grade peptides and reference standards, each lot backed by a third-party Certificate of Analysis. Built for the lab, documented for confidence.
- USA ISO 17025-accredited lab COA
- ≥99% purity, guaranteed
- Refund-backed purity promise
- 24-hour shipping
Stack up to 50% off eligible research reference standards.*
How to save the most on your order:
- 15% Sitewide Sale — auto-applied to every eligible item, no code needed
- Bulk Discount — add more items, save more (5% / 10% / 15% at 3+ / 6+ / 11+ items). Stacks on top of the sale and the coupon below.
- First-Order Coupon — new customers add another 30% off with code WELCOME30 — for a limited time it stacks on top of the sitewide sale and bulk pricing, up to a 50% maximum discount per item.
The sitewide sale and bulk pricing apply automatically — no code needed. New customers add WELCOME30 at checkout for the extra 30%. Stacked savings are capped at 50% off retail per item; see the per-line breakdown in your cart.
*See discount policy for the full rules + worked examples.
The catalog
Research peptides & reference standards
Every product ships with its own lot-specific Certificate of Analysis. Strictly for in-vitro laboratory research.
PP-3R (Reta)
PP-3R (C₂₂₁H₃₄₂N₄₆O₆₈, 39aa synthetic research peptide, CAS 2381089-83-2). Research-grade
Price range: $50.99 through $211.65 Select size
MOTS-c
MOTS-c (C₁₀₁H₁₅₂N₂₈O₂₂S₂, 16aa mitochondrial-derived peptide, MW ~2,175 Da, CAS
$46.02 Select size
The Precisely Promise
Your satisfaction, guaranteed
Backed by USA-based, ISO/IEC 17025-accredited lab testing and free shipping protection — so you can order with total confidence.
30-Day Satisfaction Guarantee
Return any unopened, factory-sealed vial within 30 days for a full refund. No restocking fee, no hassle.
99%+ Purity, Guaranteed
Every product ships with a third-party COA from a USA-based, ISO/IEC 17025-accredited lab. If it ever tests below spec, we refund you, replace it free, and cover the test.
Free Shipping Protection
Orders $150+ — and our Senior Researcher loyalty tier and up — are protected against loss or damage in transit, free. Lost or damaged? We reship or refund.
We Make It Right
If anything about your order isn't right, we'll make it right — no questions asked. A free replacement ships with a prepaid label, and any refund lands in 3–5 business days.
For research use only. Not for human consumption. All products are sold strictly as reference standards for in-vitro laboratory research and are not drugs, foods, or supplements.
Precisely Peptides
4.6
22 Reviews
Excellent Customer Service, Fast Shipping & Great Prices
I've had a great experience with Precisely Peptides. Their customer service is top notch, always quick to respond and willing to answer any questions. Shipping has been incredibly fast, and orders arrive well packaged and on time. On top of that, their pricing is very competitive compared to other companies I've looked at. Great customer support, fast shipment, and fair prices make them an easy company to recommend. Definitely one of the best experiences I've had ordering peptides.
Fast shipping
Fast shipping, reasonable pricing, helpful service. Would absolutely recommend to friends and family.
Great experience overall
Great experience overall. Highly recommended!
