What Should a Clinic Ask a Peptide Supplier Before Ordering?

Paul Bakhtiar, MBA | Published October 15, 2026

Short answer. Ask for the original manufacturer’s name and location, a batch-specific certificate for the exact lot you will receive, the testing lab’s name and accreditation scope, the tests run on every lot (identity, purity, content, endotoxin, sterility), shipping conditions with temperature records, retest or expiry dating with the stability data behind it, and the recall and complaint procedure. Written answers go in the supplier file.

What this means for your clinic. Send the twelve questions below by email before the first order, and give the supplier a week. The answers, and the speed and form they come back in, are your first quality record for that supplier. A supplier who answers in writing, with documents attached, has done this before.

What are the twelve questions?

Each question maps to a document you will need later. The list is the front end of the clinic’s guide to verifying peptides: what you ask before ordering decides what you can verify after delivery.

Question	A good answer sounds like	A poor answer sounds like
1. Who is the original manufacturer of this product, and where is it located?	A named company, city and country, whose lot number is carried through to the vial	“Proprietary,” “our partner facility,” or a name that changes with each product
2. Will I receive a batch-specific certificate for the exact lot shipped, before it ships?	Yes: the manufacturer’s certificate and the independent lab report, carrying the vial’s lot number, sent before dispatch	A stock or “representative” certificate, or one available after delivery on request
3. Which laboratory tests each lot, and what is on its scope of accreditation?	The lab’s name, accreditation body and certificate number, and a scope listing the methods used	“An ISO lab,” “in-house,” or no lab named
4. Which tests are run on every lot, by what method, against what limit?	Identity, purity, content, water, counterion, endotoxin and sterility, each with a method and a limit	“99%+ purity,” or tests run “periodically” rather than per lot
5. May I see the certificate set for the last three lots of this product?	Three sets, each with its own lot number and results that differ lot to lot	Identical figures on every lot, or “we only keep the latest one”
6. How is the product shipped, and what temperature record arrives with it?	A stated condition and a logger or indicator in every box, with its printout	“Ships cold,” with nothing to read on arrival
7. What retest or expiry date does the product carry, and what stability data supports it?	A dated label statement and a stability summary the supplier can send	A date with no study behind it, or “two years, like everyone”
8. What are your recall and complaint procedures, and who is my quality contact?	A written procedure, a named quality contact, and notice to customers by lot number	“That has never happened,” and no contact beyond sales
9. How will I be told if the manufacturer, the lab or the specification changes?	Written notice before the change, with a new certificate set	“The product is the same”
10. Will you sign a quality agreement?	Yes, on either side’s form, naming who does what	“Our terms are on the website”
11. Can the testing lab confirm its reports to me directly?	Yes, with the lab’s preferred route, a portal or a quality address	“All questions go through us”
12. Does every vial carry the product, strength, lot number and expiry date?	Yes, matching the certificate field for field	Lot number on the outer box only, or missing

Questions 1 to 5 cover traceability and testing, 6 and 7 the product over time, 8 to 10 what happens when something goes wrong, and 11 and 12 whether you can check any of it yourself.

What do the answers tell you before the first order?

Whether the supplier already lives by the benchmarks it will be measured against. Question 1 is what ICH Q7 asks of a distributor: section 17.61 has an agent, broker, trader or distributor provide the customer with the name of the original manufacturer and the batch numbers supplied.

Question 5 comes from section 7.31, which says supplier approval should include an evaluation providing evidence that the manufacturer can consistently supply material meeting specification, with full analyses on at least three batches before in-house testing is reduced. Three lots’ certificates, read together, are the cheapest version of that evaluation: different lot numbers, slightly different results, the same lab.

Questions 2, 4 and 11 come from the dietary supplement rule, which spells out when a certificate may be relied on. Under 21 CFR 111.75(a)(2)(ii), a supplier is qualified by establishing the reliability of its certificate through confirmation of its results (subparagraph (A)); the certificate must state the methods, limits and actual results (B); the qualification is documented (C); and the certificate is periodically reconfirmed (D). Part 111 binds dietary supplement makers; it is cited here as the benchmark a legitimate supplier meets, not as a clinic obligation.

Question 10 comes from FDA’s 2016 guidance on quality agreements, which describes a written agreement setting out which party performs which quality activity, including change control, and notes that the owner’s quality unit keeps responsibility for release and can’t delegate it away. For a clinic, the agreement is where questions 8 and 9 stop being promises and become terms: What Is a Quality Agreement, and What Should a Clinic’s Supplier Put in Writing?

Why do the answers need to be in writing?

Because the answers are the first documents in the supplier file, and a phone call can’t be filed. The file is the record that you qualified the supplier before ordering, and 111.75(a)(2)(ii)(C) is explicit that the qualification itself is documented, not just done. What Is Supplier Qualification, and What Belongs in a Clinic’s Supplier File? lists what sits next to the questionnaire.

Written answers also give you a baseline. When a later certificate names a different lab, the questionnaire is what shows the change, because the supplier told you in writing what it was. A supplier who answered “yes” to question 9 and didn’t notify you has broken a stated commitment, which is a different conversation from a misunderstanding.

Two answers end the process. A supplier who won’t commit to question 2 is covered in What Should a Clinic Do If a Supplier Won’t Provide a Batch-Specific COA? A supplier who won’t answer the questionnaire at all has answered the larger question: How Do You Know If a Peptide Supplier Is Credible?

Ask again on a schedule: suppliers change manufacturers, labs and staff, which is why 111.75(a)(2)(ii)(D) builds periodic reconfirmation into the benchmark.

How Helios does it

Under the Helios verification standard, which Helios Consultants LLC publishes as a documentation practice, step 1 (supplier qualification) is completed before the first order: the questionnaire answered in writing, the original manufacturer identified, the lab’s accreditation and scope checked, a quality agreement signed, and three lots fully tested before any reduced testing, with the file reviewed on a schedule. The step’s records are the supplier file (EV-06) and the questionnaire (EV-11). Step 1 is the first of the seven steps in how Helios verifies every lot. If you want help setting this up in your clinic, book a consultation.

Sources

ICH Q7, Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients, sections 7.31 and 17.61. https://database.ich.org/sites/default/files/Q7%20Guideline.pdf

21 CFR 111.75, What must you do to determine whether specifications are met? eCFR. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-111/subpart-E/section-111.75

FDA, Contract Manufacturing Arrangements for Drugs: Quality Agreements, Guidance for Industry (2016). https://www.fda.gov/media/86193/download

Educational content for licensed professionals. Not legal or medical advice. No product is offered for sale on this page.