I was sent the Focus and Energy Vitamins to try. All you do is take 2 capsules a day as needed. They have hours of long lasting energy. They are sugar and calories free and I did not experience any sugar crash. Sometimes when I am at work, I struggle with staying focused and I always have that afternoon slump. Taking these vitamins have really helped me stay focused and keep me awake! I would recommend them for sure! I need re up on them my self! Also with every purchase Life= donates a equal amount of children vitamins to children under five that are suffering from malnutrition worldwide!