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Description
It happens because your body cant transport the folate across the blood-brain barrier , where its needed for things like memory, mood, focus, and repair

Intranasal versus oral administration of lisdexamfetamine dimesylate: a randomized, open-label, two-period, crossover, single-dose, single-Centre pharmacokinetic study in healthy adult men

Was it through certain blood tests

See also Denis Noble: The Music of Life , esp pp
K.TiwariS

So it was very hard to convince myself otherwise
