RBC Life Sciences (RBCL) 10-Q 2003 Q1 Quarterly report

ROYAL BODYCARE, INC.

Exhibit 99.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Royal BodyCare, Inc. (the “Company”) on Form 10-Q for the quarterly period ended March 31, 2003, as filed with the Securities and Exchange Commission on May 14, 2003 (the “Report”), I, Clinton H. Howard, Chairman of the Board and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Clinton H. Howard                

Clinton H. Howard

Chairman of the Board

and

Chief Executive Officer

May 14, 2003

This certification is made solely for purpose of 18 U.S.C. Section 1350, subject to the knowledge standard contained therein, and not for any other purpose.