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Nez-Vergara LJ, Sturm JC, Olea-Azar C, Navarrete-Encina P, Bollo S, Squella JA
doi:10.1042/BJ20042015
10.1002/advs.202204365 80 YinS.-Y.SongG.YangY.ZhaoY.WangP.ZhuL.-M.et al (2019)
the best-evidenced caffeine + L-theanine 2:1 calm focus stack, backed by a 2026 Molecular Psychiatry meta-analysis of 31 randomised trials and a 2025 British Journal of Nutrition sleep-deprivation study
It is banned both in-competition and out-of-competition
BAC water's preservative extends the usable life of that reconstituted solution from hours (if you used plain sterile water) to weeks
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