About Caffeine
Caffeine is a substance found in coffee, tea, soft drinks,chocolates and many more things. Caffeine affects your central nervous system which increases your metabolism which makes you alert and gives energy.
How it works in fat burning?
Caffeine contains thermogenic properties which directly affects you central nervous system and increases your metabolism in effect of which you will burn more calories.
Possible side-effects
Possible side effects are jitteriness, insomnia, dehydration and addiction.