What natural supplements stimulate the sympathetic nervous system?

* Caffeine: Caffeine is a central nervous system stimulant that can increase alertness, energy levels, and focus. It works by blocking the effects of adenosine, a neurotransmitter that promotes sleep. Caffeine is found in coffee, tea, energy drinks, and some chocolate products.

* Ephedra: Ephedra is a plant that has been used for centuries in traditional Chinese medicine. It contains two alkaloids, ephedrine and pseudoephedrine, which have stimulant effects. Ephedra is often used for weight loss and energy enhancement, but it can also be dangerous and should be used with caution.

* Guarana: Guarana is a Brazilian plant that contains caffeine and other stimulants. It is often used for energy enhancement, weight loss, and improved mental performance. Guarana can be found in energy drinks, supplements, and some candy products.

* Green tea extract: Green tea extract contains caffeine and other compounds that have stimulant effects. It is often used for weight loss, energy enhancement, and improved cognitive function. Green tea extract can be found in supplements, energy drinks, and some candy products.

* Yohimbine: Yohimbine is an alkaloid that is found in the bark of the African yohimbe tree. It has stimulant effects and is often used for weight loss, sexual enhancement, and improved athletic performance. Yohimbine can be dangerous and should be used with caution.