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ALCAR crosses the blood-brain barrier more readily than LCAR, achieving better central nervous system penetration.[1][2] In elderly patients specifically, LCAR absorption appears impaired due to decreased active transport, making ALCAR the more effective option in this population.[1] However, recent pharmacokinetic data shows that ALCAR has significantly lower overall bioavailability than LCAR (7.7-fold lower area under the curve), with most absorbed ALCAR being converted to LCAR before reaching systemic circulation.[3][4] For neurological disorders , ALCAR demonstrates distinct advantages