nM

nanomole per liter

Molar concentrationexact by definition

The nanomolar is 10⁻⁹ mol/L. Receptor binding affinities, hormone concentrations in blood and high-affinity drug potencies live here: a good drug candidate has a nanomolar IC₅₀, and thyroid hormones circulate at low nanomolar.

1 nM 1.0000000e-09 M