Elizabeth R. B. Higdon

An Evidence-Based Systematic Review of Annatto (Bixa orellana L.) by the Natural Standard Research Collaboration

C. Ulbricht, D. Costa, W. Weissner, 2012, Journal of dietary supplements.

Hops (Humulus lupulus): An Evidence-Based Systematic Review by the Natural Standard Research Collaboration

E. Basch, C. Ulbricht, W. Chao, 2012 .

An Evidence-Based Systematic Review of Vanadium by the Natural Standard Research Collaboration

C. Ulbricht, W. Chao, D. Costa, 2012, Journal of dietary supplements.

An Evidence-Based Systematic Review of Senna (Cassia senna) by the Natural Standard Research Collaboration

C. Ulbricht, D. Costa, J. Conquer, 2011, Journal of dietary supplements.

Turmeric (Curcuma longa): An Evidence-Based Systematic Review by the Natural Standard Research Collaboration

H. Boon, D. Costa, Richard Isaac, 2011 .

Rhodiola (Rhodiola spp.): An Evidence-Based Systematic Review by the Natural Standard Research Collaboration

D. Costa, J. Conquer, Samantha Culwell, 2011 .