I read about fake TESTING! I mean allegedly many analytical labs sometimes verify label claims without any testing at all! So you can trust products that haven't been tested but can't trust tests either.
I saw this fella on reddit talking about this. He's the owner of nootropicsdepot.com. He seems reputable and honest. Said fake testing is a huge problem in the industry. He's the one who said all turkesterone he tested was fake. Here he shows their in-house lab.
He sells bulk powders of other brands too, like Ksm-66 and Sensoril. Said he removed some claims the brands make because he couldn't verify them in his lab, something strange going on with those extracts. "They work and do contain ashwagandha but we can't verify all their claims. But we sell them because customers want them."
I might be completely wrong but I doubt amazon is selling counterfeits. It's the brand's fault. Of course if you confront them they will say it was an honest mistake, not a conscious ripoff.