Something that's helped me, without having to resort to smart drugs, or anything like that, is increasing your vitamin intake from natural sources, I get the natural vitamins (made from real fruits and vegetables, not manufactured ones in a lab, you have to look for them as they don't sell them everywhere and they are more expensive) and also drink a lot of vegetable juice or the veggie / fruit juice mixes (look for the light ones or sodium free ones if you want to keep it as healthy as possible). I don't know for sure if is a placebo effect or if it really boosts energy short term, but I feel like it can sometimes give me a boost and just feel healthier and more awake overall.