Fig. 2
From: Herbs and Spices- Biomarkers of Intake Based on Human Intervention Studies – A Systematic Review
Examples of the most representative metabolites for each herb/spice identified in the reviewed studies. HMDB ID; phytohub code (PHUB); −G, glucuronide; −S, sulfate; aldehyde-menthol glucuronide (M2); menthol sulfate conjugates (M29); 
in the blood; 
in urine; 
in feces; 
in the intestine; 
in the liver