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our CBD isolate contains zero THC.
"zero" has a mathematical meaning and also a regulatory meaning in terms of permitted contaminants in food and drugs. I'd be quite surprised if they could meet the mathematical definition at a price tolerable to retail consumers, if at all.
The link I provided says 99.9% CBD in the isolate product, which is pretty good for commercial grade chemicals and presumably meets the regulatory definition of pure. When you start adding more 9s on the end of that, the price goes up very fast.
This is why "alcohol free" actually means <0.5%; if you tried to get lower, it would be too expensive.
Guess it depends how much faith you put in their marketing spiel
"Medterra CBD Isolate is made from certified industrial hemp and not the cannabis associated with marijuana. Industrial hemp-derived CBD is federally legal in the United States, and our CBD isolate contains zero THC.
https://medterracbd.com/news/will-cbd-show-up-on-a-drug-test/