Before paying any research supplier, in Thailand or anywhere else, walk through this checklist. Green flags to confirm. Red flags to walk away from. Save or print this and use it on every supplier you consider.
Buyer Checklist
A trustworthy research supplier is specific about what is documented, who tested it, how ordering works, how payment is handled, how shipping moves, and what their products are not for. Vagueness on any of these is a warning sign.
Green Flags
Look for these seven signs of a supplier worth considering. None of them by itself guarantees trust, but the absence of any one is a problem.
Per-product COAs that name the batch and the lab. Not a generic "lab tested" badge.
A box QR code should open a supplier-controlled verification page showing the same batch code, product, lab, and COA image.
The site explains what happens after checkout, before any money moves.
A documented way to submit payment proof, with the supplier confirming before dispatch.
Dispatch timelines, tracking process, and what to do if a package is delayed are written down.
The site avoids dosing, treatment, cycle, and human-use claims. It treats the product as research material.
A real contact channel for order, product, or documentation questions, with a stated response time.
Red Flags
These patterns repeat across complaints in research supply communities. If you see two or more, treat the supplier as high-risk.
The same COA template across many products, with only the name swapped. No batch numbers. No lab signature.
The QR opens a homepage, a blurry image, a supplier page with no matching batch, or a dead link. That is not batch verification.
Every product shows 99.x% purity. Real testing has variation. Identical perfect numbers usually mean marketing, not measurement.
Without a batch number, the COA cannot be tied to your vial. It is a brochure, not evidence.
"Independently tested" with no named lab is unverifiable. A real lab can be looked up.
Suppliers who hint at human use, cycles, or medical benefit are crossing a line that legitimate research suppliers do not cross.
If the order flow rushes you past documentation, support questions, or research-use language, slow down.
A supplier with no business address, no Thailand presence (if claiming Thailand), and no named operator is a black box.
Wallets or accounts that change between orders, no payment proof process, or vague refund/replacement policies.
Trust Test
There is a difference between a supplier saying they are transparent and a supplier being transparent. Words are cheap. Documents are not.
Trust language sounds like: "premium quality", "lab tested", "trusted by researchers worldwide", "highest purity".
Trust evidence looks like: a named lab, a batch-specific PDF, a method section, a date, a signature, and a process you can read before you pay.
Apply this test to every supplier, including Carteum. Ask: did they show me a document, or did they only say nice words?
Carteum Position
Carteum is building around process clarity first. That means:
Use this checklist on Carteum the same way you would use it on any other supplier. If something is unclear, ask before ordering.