Not just "not recomended", but strongly stated in red print in the Ruger LCP owners manual to not use +P ammunition.
Actually, there is no SAAMI +P standard for 380 ACP. What companies are telling you is that their 380+P ammo is possible loaded above safe SAAMI standard pressure.
It's your gun, your skin, your blood. You decide.
For myself, the Hornady Critical Defense is fine.