The primary source of caffeine is the coffee bean. The plant makes the poison to keep things from eating its seeds. If you were to make a straight diet of coffee beans you would die of heart failure.
Yes, coffee is a natural source of caffeine.
Alfalfa (Medicago sativa) is naturally caffeine-free. It is a nutrient-rich legume commonly used as animal feed and in dietary supplements, but it does not contain caffeine or other stimulants. Therefore, if you're looking for a caffeine source, alfalfa would not be a suitable option.
Coffee, tea.
It has half the amount of caffeine that coffee has
Caffeine from any source, be it tea leaves, guarana seeds, coffee beans or from a synthetic manufacturer, will always be the same chemical, otherwise it could not be called caffeine. From any source, caffeine will be C8H4N10O2, and will have the same properties.
cacao trees
false
cacao trees
that's because caffeine causes you to lose more water than normal in your urine.
cocoa
Yes. Tazo is caffeinated unless explicitly stated on the box as either "decaffeinated" or "caffeine-free". Source: tazo.com
It if doesn't have any animal byproducts, there is a good chance that it is Kosher. Caffeine is an artificial chemical, and therefore poses no Kashrus problems.