 chemical signature for compounds. And there's kind of like a fingerprint for every compound that's out there. A fingerprint for curcumin, a fingerprint for ginkgo biloba, active extracts, etc. Okay? And they know what that is. And so when they look at materials, they got to make sure, you know, they order materials. Sometimes the materials come, you know, from farmers or even from overseas, from Asia or from India. You want to make sure that the products really contain what they're supposed to contain. So they do that.