"Brain octane" refers to a type of fuel for the brain. It is a high-quality fat that can provide energy and support mental clarity and focus. Full definition
Add 1 serving of Bulletproof Brain Octane oil or XCT oil. (amazon.com)
This includes a kaleidoscopic mix of powders: matcha green tea, Bloom Pure Raw Honey, maca powder, Philosophie Love Cacao Magic & Green Dream powder, Mattole Valley Vanilla Naturals Plant Protein no. 1 mixed with Bulletproof Brain Octane Oil, cinnamon, turmeric, ginger, black pepper, and steaming hot water. (mindbodygreen.com)
I only use Brain Octane in my coffee, as it's too expensive to cook with. (paleoketogenicdiet.com)