Hmm. There are lots of herbs and foods that can increase energy, but depending on the reason you need energy, it could just mask a more fundamental problem.
Fatigue and frequent tiredness is a sign of stress, either emotional or physical. Make sure you take time to rest and unwind, and address health concerns. Quite a few of my friends have had improvements in energy levels after diet changes. Me, my partner, and my friend Nathan all have much better sustained energy since we've stopped eating grains. Many people are fatigued from undiagnosed immune responses to foods they eat. This immune response can be exhausting to the body over time.
Besides rest and attention to overall wellness, there are many things that can help with energy levels. The most popular, caffine, works by blocking tiredness signals in the brain. It just makes it so that you don't feel tired. Mineral supplements help some people, electrolyte balance is important in energy maintenance. Other nutrients are important,too. A lack of B vitamins or iron can increase tiredness.
A tea like nettle is a good general tonic to improve vitamin and mineral deficiencies. Those food allergies I mentioned before can reduce the ability of people to absorb nutrients, so do look into that.
Many people have laggy times during the day due to blood sugar regulation issues. Notice when you are tired. It can tell you if food or adrenal fatigue(stress) is the problem. Smaller snacks throughout the day that include fiber, fats, and/or protein could help, if the issue is related to how or what you eat.
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