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Although naturally present in many foods, it's also eaten as a dietary supplement

doi: 10.1007/s00421-007-0636-z
In addition, clinical studies have suggested that DSIP may also have beneficial effects on stage-4 sleep, which is also known as REM sleep and the phase when dreaming occurs [3, 4]
Expression cloning and characterization of a transporter for large neutral amino acids activated by the heavy chain of 4F2 antigen (CD98)
