what is bulletproof coffee?
Bulletproof Coffee is a branded coffee drink consisting of Upgraded black coffee blended with grass-fed butter and Brain Octane oil (an 8-carbon fraction of medium-chain triglyceride oil). The recipe was created by Dave Asprey and first posted to his blog in 2009.he Bulletproof Coffee recipe was first developed by David Asprey after traveling to Tibet and tasting yak-butter tea drinks.