The D-isomer is psychoactive (meaning, it could change brain function and potentially result in altered consciousness, perception, mood or behavior).
DEA records showed that the methamphetamine that it seized and tested in the first half of 2011 had 76 percent D-isomer on average.
Polymerized from lactides with very low D-isomer
content, they go beyond the capabilities of high-heat grades such as Ingeo 4032D and 3001D, which were introduced for these applications only a year ago.
It has been found in work  that this polymer consists of L-isomer 92% and D-isomer
It is the D-isomer
of ribose that has been shown to possess biological activity.
L-Carnipure is Lonza's 100% guaranteed pure, natural L-carnitine, and does not contain the harmful D-isomer
Dextromethorphan is a prodrug converted to the D-isomer
of levorphanol, a semisynthetic morphine derivative, which noncompetitively antagonizes N-methyl-D-aspartate (NMDA) receptors, and possibly also affects serotonin receptors.
Dextromethorphan is a prodrug converted to the d-isomer
of levorphanol, a semisynthetic morphine derivative, which non-competitively antagonizes N-methyl-D-aspartate (NMDA) receptors, and possibly also affects serotonin receptors.
JAMA, 1986), only the L-isomer is available, with the D-isomer
(if found in commercial L-carnitine supplies) being present in trace quantities that have yet to be shown to be biologically undesirable in vivo.