Dave Asprey is best known as the founder of Bulletproof, a company that sells health supplements, food products, and other items, many of which are centered around Asprey's concept of \"biohacking.\" Biohacking involves making changes to one's lifestyle to \"hack\" one's biology and optimize health, energy, and performance.One of the most famous products promoted by Dave Asprey is the \"Bulletproof Coffee,\" which is a blend of coffee, grass-fed unsalted butter, and medium-chain triglyceride (MCT) oil. He claims that this mixture can help with weight loss and cognitive function.In addition to his business ventures, Dave Asprey is an author, having written several books about his approach to health and wellness, including \"The Bulletproof Diet\" and \"Head Strong.\"Critics have challenged some of Asprey's claims, suggesting that there's limited scientific evidence for many of the benefits he attributes to his products.