Short answer: check that the listing shipped from the brand or an authorized seller, then match the batch or lot code on the bottle you received to a public lab certificate for that batch. If the code matches a real certificate from a named lab, the bottle is genuine. If the code is missing, unreadable, or matches nothing, consider the certificate chain unverified and contact the brand.
Why Amazon is a special case
Amazon uses commingled inventory: when a listing is fulfilled by Amazon, units from many third-party sellers of the same product can be pooled in one bin. That means a bottle listed under the official brand can physically originate from a seller the brand never authorized. This is the most common source of authenticity complaints shoppers raise about supplements bought online.
The five-step checklist
- 1. Check who it ships from. On the listing, read "Ships from" and "Sold by." Brand-owned or brand-authorized is the safe case. Third-party sellers on a brand's listing are where commingling risk concentrates.
- 2. Read the batch or lot code on the bottle. Every genuine bottle carries a lot code and an expiration date, usually stamped on the base or the label seam. No code, or a sticker covering the original code, is a red flag.
- 3. Find the certificate for that batch. A brand that publishes independent lab certificates will have one tied to your lot code. Match the code on the bottle to the code on the certificate.
- 4. Confirm the lab. The certificate should name an accredited lab and a test date. A report from a lab you cannot find, or with no date, does not confirm anything.
- 5. Check the seal and label. Compare the safety seal, print quality, and font against the brand's official product images. Blurry print, spelling errors, and a missing seal are physical red flags.
What each outcome means
If the lot code matches a public certificate from a named, accredited lab, the bottle is genuine and you are done. If the brand publishes certificates but none matches your lot, the bottle is unverified, and the brand's support team can confirm whether that lot is theirs. If the brand publishes no independent certificate at all, there is nothing to verify against, which is a gap in the brand's transparency rather than a judgement on the bottle.
The shortcut
ScanCheck automates steps three and four. It holds a live index of 20,407 public certificates across 1,174 brands. Point your camera at the label: a green verdict means the brand has a public independent certificate on file, shown with the batch, lab, date, and method. Amber means the brand is indexed but this batch is not on file yet, so you can request it. Red means no public independent certificate exists to check against.