BioTechUSA BLACK BLOOD CAF+

Black Blood CAF+ sits at the top of the stimulant scale. At 400mg of caffeine it is not a product to try on a whim, and it is not one to take late in the day - this is built for people who already know how they react to a heavy dose.

The caffeine does not arrive alone. BioTechUSA pair it with L-arginine and L-citrulline for blood flow, beta-alanine for endurance, L-tyrosine and inositol for focus, plus vitamins, minerals and BioPerine black pepper extract to support absorption. The formula is sugar free.

A tub holds 40 servings, which is a generous count for a pre-workout at this strength.

It comes in Blueberry. Start with half a serving the first time, and take it early - at this dose an evening session will cost you a night's sleep.