Coffee made with butter from grass-fed cows started to make waves early last year as promoters promised it would give drinkers more energy. Bulletproof Coffee, the self-proclaimed inventor of the drink, was able to raise $9 million in capital to open stores by July. Another company, Grass Fed Coffee has launched this “butter coffee” in a ready-to-drink format promoting it with a custom vehicle in California. It reports that its Kickstarter campaign was the most funded beverage campaign in Kickstarter history, reports International Comunicaffe.