October 2026 issue · Editors' star ratings, never reader reviews · How we rate
Rated.Peptides

A buyer's magazine for research peptide suppliers

Head to head · October 2026

Direct Peptides or Koi Peptides?

On our stars Koi Peptides comes out ahead, 3.6 to 2.5. Both let you open a certificate before you spend anything, so paperwork will not separate them for most buyers. Both take cards.

2.5 / 5
Editors’ rating, not reader reviews
Paperwork2.0
Company1.6
Price2.3
Shopping4.0
3.6 / 5
Editors’ rating, not reader reviews
Paperwork4.1
Company3.2
Price3.3
Shopping3.5

At a glance

Direct Peptides

  • StatusTrading
  • BasedNot published
  • Trading sinceNot published
  • Outside laboratoryLimited
  • Laboratory namedNone
  • Certificates open to allYes
  • Certificates per lotNo
  • Reference vialNot listed
  • Free shipping fromNot stated
  • Ways to paycard, wire, zelle
  • Ships abroadYes
  • ShelfNot counted; vials, pens, nasal, capsules, blends
  • FDA letterNone on record

Koi Peptides

  • StatusTrading
  • BasedSheridan, WY (registered address); warehouses Austin, TX and Long Beach, CA
  • Trading since2022
  • Outside laboratoryYes
  • Laboratory namedFreedom Diagnostics
  • Certificates open to allYes
  • Certificates per lotYes
  • Reference vialNot listed
  • Free shipping from$200
  • Ways to paycard, ach, wire
  • Ships abroadYes
  • ShelfNot counted; vials
  • FDA letterNone on record

Both companies sell materials labeled for laboratory research use only. Full reviews: Direct Peptides · Koi Peptides.

Reader questions

So, Direct Peptides or Koi Peptides?

On our stars Koi Peptides comes out ahead, 3.6 to 2.5. Both let you open a certificate before you spend anything, so paperwork will not separate them for most buyers. Both take cards. The widest gap between them is in paperwork, where Koi Peptides leads.

Can I read a certificate from each before I order?

At Direct Peptides the certificates are open to anyone, though they are not tied to a lot. At Koi Peptides the certificates are open to anyone and each one is tied to a lot.

Are these reader reviews?

No. Both ratings come from our published formula applied to facts on each supplier’s own pages and in public records. Nobody can submit a rating here.