Does Starbucks "spike" their coffee? Add extra caffeine?

Do they treat it chemically, or add caffeine, or something? I have two containers of the same type of coffee - one's Starbucks, and the other is another brand made by a company that boasts about being "organic" and "natural." The coffee beans look the same, same type, same darkness of... show more Do they treat it chemically, or add caffeine, or something?

I have two containers of the same type of coffee - one's Starbucks, and the other is another brand made by a company that boasts about being "organic" and "natural."

The coffee beans look the same, same type, same darkness of roast, etc., and smell SIMILAR but the Starbucks container has a "sharper" odor.

I know from brewing coffee from both that the Starbucks batch IS stronger, has more caffeine.

Do they spike their coffee?

If so, why?
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