The best green powders are packed with at least 25 to 40 greens and vegetables so that your diet is fortified. To improve its healthy factor, most super green powders are a form of Sugar free Healthy Greens Powder. The powder will have a bit grassy taste and will be sugar-free. Other powders can also have natural sugar substitutes that are low on calories. Such powders are designed for fitness enthusiasts and gym-goers.