Xtant Medical (XTNT) 10-Q 2013 Q2 Quarterly report

Exhibit 32.1

Section 1350 Certification of Co-Chief Executive Officer

In connection with the Quarterly Report on Form 10-Q of Bacterin International Holdings, Inc. (the "Company") for the quarterly period ended June 30, 2013 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, John Gandolfo, Interim Co-Chief Executive Officer of the Company, certify, to the best of my knowledge and belief, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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 (15 U.S.C. 78m(a) or 78o(d)); 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/ John Gandolfo

John Gandolfo

Interim Co-Chief Executive Officer

Date:  August 12, 2013