Instant Ketones:- Usually, you’ll find exogenous ketones within the shape of powdered ketone salts. Less not unusual are ketone esters, that are the purest form of ketones. Griffin says they work quickly (in 10 to 15 mins, rather than an hour for the salts) and efficaciously, but they’re more luxurious, have a more-revolting taste, and are tougher to discover (HVMN is one U.S. Company that sells them).