User blog comment:B214/Question and Answers 6/@comment-203.59.190.84-20170605110837/@comment-30924344-20170605112310

No. Vali has absorbed half the power of countless foes and not once has it ever been stated he absorbed anything harmful. He absorbs the power but he doesn't literally add it as his own. He absorbs the energy of the power to increase the energy of his own.