Asprey claims that his Upgraded beans undergo a secret, proprietary process that all but eliminates mycotoxins. He also claims that mycotoxins are the reason you coffee is bitter.
This is almost entirely bullshit.
For starters, while mycotoxins can grow on coffee beans, the coffee industry has known about this for decades. This is why wet-processing was developed; a technique employed by nearly every roaster in the world, wherein the beans are washed, and nearly all mycotoxins are eliminated.
This is something that is regulated both internationally and in the U.S. In fact, one Spanish study found that people who drank four cups of coffee a day (and this is any brand of coffee, regardless of price and quality) had only 2-percent of what is considered a safe level of mycotoxins.
In other words, you could drink 199 cups of coffee in a day and still be under the safe limit for mycotoxins. Further, mycotoxins are everywhere, including human breast milk, and a lot of the meats Asprey recommends in his own Bulletproof Diet.