Natural energy (Caffeine derived from green coffee beans). Boosts metabolism. Supports fat loss. Sharpens mental focus. Boosts Metabolism & Supports Fat Loss: Accelerates calorie burning. Sharpens Mental Focus: Clinically studied to elevate alertness. Promotes Well-Being: Designed to help you feel your best. Zero artificial colors. Boosts metabolism & supports fat loss (In combination with a calorie reduced diet designed for weight loss and an active lifestyle, C4 Smart Energy supports fat loss by increasing calorie expenditure).