General Discussion

From Bing:
Caffeine pills are made from caffeine extracted from natural sources such as coffee beans, tea leaves, or cocoa beans1. The caffeine is then purified and combined with other ingredients to create the final pill formulation1.

So the only place in the USA that grows coffee is in Hawaii, and that's already expensive coffee. They won't be using that. I never heard of a tea plantation in the USA either.

So the caffeine is going to be coming from another country, and be subject to tariffs, or the pills themselves from another country and again, tariffs.

At least as it appears after minimal research.