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. 2019 Dec 7;11(12):659. doi: 10.3390/pharmaceutics11120659

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Salivary caffeine concentration over time after administration of a Vcaps^® plus capsule with 25 mg caffeine to one healthy volunteer after a 10 h fasting period. Left: Whole observation time frame. Right: Detail of the first 20 min.