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A 2015 review article noted that 300 milligrams to 800 milligrams a day of phosphatidylserine are absorbed efficiently in humans, and according to the Natural Medicine Comprehensive Database, therapeutic doses for a failing memory is 100 milligrams taken two or three times per day.
You can boost your intake of phosphatidylserine though food—it's available in a number of foods, including soy (which is the main source), white beans, egg yolks, chicken liver, and beef liver. Unfortunately, it's difficult for your body to absorb sufficient amounts from dietary sources. *
A standard dose of phosphatidylserine (PS) is 100 mg, taken 3 times a day to total 300 mg daily. This dose seems to be effective as a daily preventative against cognitive decline, and 100 mg once daily may provide some degree of benefit (but may be lesser than 300 mg).
Studies in children and adolescents for the purpose of attention improvement tend to use 200 mg, and a dose of 200-400 mg has been used in adult non-elderly humans with success. Animal evidence tends to use a dose correlating to 550 mg as well. *