3

I bought those pills on Amazon and they're in the original bottle. (The seal is opened)

4

Yes

Caffeine is a legal medication in the US, and caffeine pills are sold over-the-counter in every drugstore and supermarket with no prescription required (up to 200 mg per pill, I believe).

Pills generally are allowed in either checked or carry-on luggage. See https://www.tsa.gov/travel/security-screening/whatcanibring/all and search for "pills" or "medication". They don't fall into any prohibited category like sharp objects, explosives, or liquids.

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