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PMID 26844979

Not inherently, but misuse or high stimulant content can cause side effects
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Presynaptic cytoplasmic Ca 2+ can be depleted by several complementary mechanisms, including sarcoendoplasmic reticulum Ca 2+ -ATPase (SERCA) to the endoplasmic reticulum (ER), plasma membrane Ca 2+ -ATPase to the extracellular space, and MCU to the mitochondrial matrix [51,52,53]

Well cover the main ALCAR benefits below [3]