Why the supplier matters more than the price
Research peptides look identical in the vial — a white lyophilized puck. The only way to know what you're getting is documentation and a supplier that stands behind it. A cheap vial with no paperwork is an unknown, and unknowns ruin experiments.
The 7-point checklist
Before you add anything to cart, confirm:
- COA per batch — the lot number on the document matches the lot on your vial.
- Testing method named — HPLC for purity, mass spectrometry (MS) for identity.
- Exact quantity — mg per vial stated clearly, separate from vial size.
- Domestic US shipping with tracking and a stated handling time.
- Storage guidance — lyophilized vs. reconstituted handling explained.
- Clear research-use-only positioning — no human dosing or cure claims.
- Real contact options and published shipping and return policies.
Red flags to walk away from
Before-and-after photos, 'clinically proven' language, injection tutorials, or prices that are wildly below market. Legit research suppliers don't market to consumers as if peptides were supplements.
Retail vs. wholesale buying
Single vials suit pilot work. Labs running repeat protocols usually save with 10-vial packs — Proper Peptides reserves wholesale pricing for wholesale clients, rather than displaying it in the public shop.
Frequently asked questions
- Is it legal to buy research peptides in the USA?
- Many peptides are sold in the US as research chemicals for laboratory use only, not for human consumption. Rules vary by compound and state, so buyers are responsible for compliance in their jurisdiction.
- What is a COA for peptides?
- A Certificate of Analysis is a lab report for a specific batch showing identity (usually mass spec) and purity (usually HPLC). It should list the lot number, test date and method.
- How fast do US peptide orders ship?
- Handling times vary by supplier. Proper Peptides states next-business-day dispatch, often the same day; review delivery options for your address at checkout.