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. 2021 Jul 22;13(8):2503. doi: 10.3390/nu13082503

Figure 1.

Figure 1

An illustration of the caffeine absorption process. Following doses of 3 to 9 mg kg−1 of body mass, caffeine is completely absorbed by the gastrointestinal tract and peaks in the plasma in a dose-dependent manner within approximately 60 min after ingestion [4].