Air travel: Can I take caffeine pills on a US national flight? UU.?

Caffeine is a legal medicine in the US UU And caffeine pills are sold without a prescription in every pharmacy and supermarket without a prescription (up to 200 mg per pill, I think).

Pills are generally allowed in checked or hand luggage. See and search for "pills" or "medications." They do not fall into any prohibited category, such as sharp objects, explosives or liquids.