Contrary to the native peptide, teriparatide prepared as hydrophobic ion pair (with SDS) demonstrates great stability in ethanol over 28 days (see Figure .1b). The AUC was maintained over the 28-period with slight increases in AUC which could be attributed to evaporation of some of the solvent. Further, no difference in retention time or peak shape was observed suggesting that the peptide remains stable in ethanol when complexed with SDS.