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"The authors regularly interact with professional team sport players in European and American leagues and their multidisciplinary support teams, and we are aware of players receiving regular intravenous nutrition (IVN) products" Lewis et al (2022).
Intravenous nutrition among professional athletes

Extract:

“The authors regularly interact with professional team sport players in European and American leagues and their multidisciplinary support teams, and we are aware of players receiving regular intravenous nutrition (IVN) products. Furthermore, this is often evident in blood biomarker profiles where specific nutrients are beyond the upper-bound measurement limit of the clinical laboratory. The precise prevalence of IVN use is not known, however, anecdotally some players are receiving IVN as often as weekly as part of a pregame or postgame routine. So-called ‘drip bars’ and concierge IVN services are easily accessible, although seemingly devoid of appropriate regulation.”

Reference:

Lewis N, Hodgson A, Khanbhai T, Sygo J, Mazur J, Smith C, Catterson P, Pedlar C. Rise of intravenous nutrition products among professional team sport athletes: reasons to be concerned? Br J Sports Med. 2022 Aug 16:bjsports-2022-105883. doi: 10.1136/bjsports-2022-105883. Epub ahead of print. PMID: 35973754.