The invention relates to physically stable compositions in the form of an injectable aqueous solution with a pH from 6.0 to 8.0, comprising at least:a) a basal insulin whose isoelectric point (pI) is comprised from 5.8 to 8.5, andb) a co-polyamino acid bearing carboxylate charges and at least one hydrophobic radical.本發明係關於呈pH 6.0至8.0之可注射水溶液形式的物理穩定組成物,其包含至少:a)等電點(pI)為5.8至8.5之基礎胰島素,及b)帶有羧酸鹽電荷及至少一疏水基之共聚胺基酸。