Pipecolic acid (piperidine-2-carboxylic acid) is a small organic molecule which accumulates in pipecolic acidemia. It is the carboxylic acid of piperidine.
It can be associated with some forms of epilepsy.
CRYM, a taxon-specific crystallin protein that also binds thyroid hormones, is involved in the pipecolic acid pathway.
Pipecolic acid was identified in the Murchison meteorite.