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The main mechanism of the harmful hypoxia effect is the disruption of oxidation processes in conditions of oxygen deficiency through uncoupling of respiration and oxidation processes and switching the metabolism to the glycolytic pathway, which, however, does not provide sufficient energy production

Worth noting, caffeine is definitely not the only stimulant in either of these drinks--or others on the market--so it's probable that the FDA investigation may lead to further ingredient probing

Hormones play a big role in sperm production and ejaculation

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