There are several reasons why you may be experiencing a lack of energy. Some of these may be lifestyle issues, and others may be more health related.
Here are some of the major reasons you may be experiencing a lack in energy:
Lack of sleep - Not getting enough sleep a night may be sapping your energy throughout the day. A quick remedy is to try and make more time for bedtime and attempt to go to sleep earlier.
Dehydration - Not drinking enough water is also another problem that many people overlook. If you're not hydrated enough, this can present as fatigue and make you more tired.
Poor diet - Not getting the right nutrients in your diet throughout the day can also contribute to issues like tiredness and fatigue. Making sure you're getting enough vitamins and minerals can help to mitigate this issue.
There are obviously more causes, but these are some of the main issues that people overlook. You may want to check if there is anything in your lifestyle you can change before taking energy supplements to help you get the best out of them.