Quick answer: Warning signs include a COA with no lot number, no named testing lab, health or dosing claims on an RUO site, prices far below the rest of the market, and no clear contact or shipping terms. A coupon code is not a quality signal either way.
Paperwork red flags
- No lot number on the certificate, or one that does not match your vial.
- No named lab, or a lab you cannot find.
- One certificate reused for different products.
- A purity figure with no method or chromatogram.
Marketing red flags
- Health claims. A research-only seller that describes benefits for people is a warning in itself.
- Dosing instructions for research products.
- Guaranteed or perfect purity claims such as “100% pure” with nothing behind them.
Business red flags
- No contact details, no shipping policy and no returns terms.
- Prices far below every other vendor for the same compound and size.
- Pressure tactics such as countdown timers and constant new codes.
- Only payment routes with no buyer protection.
Positive signs
Lot-specific reports from a named laboratory, clear shipping and handling information, a plain research-use-only statement and a vendor that answers questions about its paperwork before you buy.
What a coupon code tells you
Nothing about quality. A code lowers a price. Use it only after the vendor passes the checks above, then compare the final price per mg with the calculator.
FAQ
Is a cheap vendor a red flag?
Not automatically, but a price far below the market deserves a closer look at the paperwork.
Do many coupon codes mean a vendor is risky?
No. Many legitimate stores run codes. The paperwork matters far more.
Can you recommend a vendor?
No. This site lists codes and prices and does not rank vendor quality.