synthetic - involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis; limnology is essentially a synthetic science composed of elements...that extend well beyond the limits of biology- P.S.Welch.
L-theanine is most effective in the range of 50-200 mg, with the effect being felt within 30 minutes and lasting for 8-10 hours. Individuals with high stress levels may increase their dosage of L-theanine to at least 100 mg, with no more than 600 mg being taken in a six hour period. FDA recommends a maximum dose of 1200 mg daily, although the reason for this limit is not clear, due to its demonstrated safety. There are no known adverse reactions to L-theanine and no drug interactions have been reported. L-theanine is not affected by food and may be taken anytime, as needed.
In the case of Vyvanse (lisdexamfetamine dimesylate), once it is absorbed by the body, an amino acid (l-lysine) is cleaved off the molecule in the liver, leaving dextroamphetamine, the active ingredient. The maximum concentration in the blood (Tmax) is reached in about 3.5 hours.