A storage stable L-menthol composition includes a tablet, caplet, capsule, or sachet dosage form. The dosage form has (a) a plurality of individual cores containing an L-menthol source and at least one pharmaceutical excipient and (b) a proteinaceous coating of a continuous film of proteinaceous material over the individual cores forming a plurality of proteinaceous coated individual cores. The film is effective to substantially prevent L-menthol in the L-menthol source from leaving the individual cores when stored at a temperature of 40 degrees C. and 75% relative humidity for at least 1 day. The dosage form contains an effective amount of the L-menthol source for treating a gastrointestinal disorder.
