“…To diminish the unwanted complications of insulin administration and increase the patient’s compliance, various research teams tried to incorporate it in multiple carriers for oral administration [ 146 , 147 , 148 ]: liposomes [ 149 , 150 ] mixed micelles [ 151 , 152 ], nanoparticles [ 153 , 154 , 155 ], intestinal patches [ 156 ]. Current studies also explore other access ways for insulin administration: intranasal [ 157 , 158 , 159 ], transdermal [ 160 , 161 ], and sublingual [ 162 , 163 ].…”