All this adds up to some products receiving a “Best Seller” tag that clearly are not the cream of the crop. As a rule, you should always double-check the brand name of your product, and who is handling the selling and shipping. You’re more likely to be purchasing a legitimate “Best Seller” when purchasing products shipped and sold by Amazon . Your next best bet is a product sold by a third-party seller with the shipment order fulfilled by Amazon. It also pays to be skeptical of reviews, which don’t always equal a quality product, and use review analytics services like Fakespot to determine their legitimacy.