Start with the exact domain. Look for spelling changes, extra hyphens, copied logos, or messaging accounts that redirect you to a different payment recipient. Confirm the company name, support email, refund terms, and shipping expectations directly on the official website. Treat screenshots of certificates as starting points rather than proof; check whether the laboratory can be identified and whether batch details are consistent. Search moderated reviews and report databases, but also consider recency and whether a complaint was resolved. Avoid urgency, gift-card requests, cryptocurrency-only pressure, and requests to move the conversation to an unverified account. Keep invoices and communication records. If a supplier cannot explain identity, product documentation, and refund terms clearly, pause the transaction.

Educational notice: This article is general information and not medical, legal, or financial advice.