How do energy supplements work?

The top secret about energy boosts is that a majority of them contain caffeine. The same ingredient found in most coffees and some teas. Caffeine works by boosting metabolism, which results in a sense of heightened physical and mental energy. Some herbs, such as Guarana contain small amounts of caffeine. When it comes to caffeine, the key is to not overdo it. However, some vitamin suppliers, list their ingredients upfront. Other herbs, such as Asian Ginseng, don’t necessarily contain caffeine but they tend to contain a lot of filler ingredients.