Many drugs have mirror chemical structures, one helpful and the other harmful – a Nobel-winning discovery allows chemists to make either on demand

Two researchers won the 2026 Nobel Prize in chemistry for developing asymmetric organic synthesis, a method letting chemists manufacture only one 'handedness' of a molecule instead of a mixed batch of helpful and harmful mirror-image twins.

The piece traces the stakes through thalidomide, whose two isomers produced sedation on one hand and birth defects on the other, and resveratrol, where the author's own lab work suggests conflicting Alzheimer's trial results may stem from researchers unknowingly testing both a beneficial and a neurotoxic form of the same compound.

The underlying mechanism involves an enzyme, TyrRS, whose levels drop differently depending on which mirror-image form of tyrosine or resveratrol is present, with implications for understanding why some Alzheimer's treatments have backfired in trials.

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