Rafael Palmeiro cited a vitamin he received from Baltimore Orioles teammate Miguel Tejada as possibly causing the positive test for steroid use that led to the first baseman's suspension. Tejada dismissed the assertion made by Palmeiro as implausible. Palmeiro said he received vitamin B-12 from Tejada, a person familiar with Palmeiro's unsuccessful grievance hearing to overturn the suspension said Thursday on condition of anonymity because the proceedings were secret. ``Right now I'm in shock,'' Tejada, a former American League MVP, said after Baltimore lost to the New York Yankees on Thursday night. ``I've never given anybody steroids before,'' he said. ``I've been checked out three times already, and I'm clean. I've been clean all my life.'' Tejada said he gave Palmeiro the B-12 injection ``a long time ago.'' ``It doesn't bother me because I'm not guilty. I've done nothing wrong. I just gave him B-12, and B-12 is legal,'' Tejada said. ``You don't get caught for B-12.''