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1 Oxygen Is Not Always Better in Greater Quantities‌Inhaling oxygen is not inherently beneficial or optimal in excess. The human body functions best in an atmospheric oxygen concentration of approximately 20%; both higher and lower levels are detrimental. Excessive oxygen intake does not improve respiration—since healthy individuals already have arterial oxygen saturation near 97%, approaching full hemoglobin capacity, additional oxygen is largely wasted. Instead, it may lead to oxygen toxicity and elevate levels of harmful reactive oxygen species. Unless suffering […]