| Host and Biospecimen | Status | Mean   | Std   | Min   | Max   | Units | Age | Sex | Health Condition | Data Source | Reference | 
|---|
| Human Feces | Detected and Quantified | 12400 |  | 4000 | 53000 | nmol/g wet feces | Adult (>18 years old) | Both | Normal | HMDB | 6740214   | 
| Human Urine | Detected and Quantified | 0.18 | 0.044 |  |  | umol/mmol creatinine | Adult (>18 years old) | Both | AIDS | HMDB | 9071566   | 
| Human Urine | Detected and Quantified | 0.131 | 0.013 |  |  | umol/mmol creatinine | Adult (>18 years old) | Both | Normal | HMDB | 9071566   | 
| Human Saliva | Detected and Quantified | 1470 |  | 0 | 2940 | uM | Adult (>18 years old) | Both | Normal | HMDB | 12097436   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Intestinal infections | HMDB | 14684577   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Crohn's Disease | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Ulcerative Colitis | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Crohns disease | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Ulcerative colitis | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Campylobacter jejuni infection | HMDB | 17314143   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Clostridium difficile infection | HMDB | 17314143   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 17314143   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Ulcerative Colitis | HMDB | 17314143   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 18052033   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 18085514   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Colorectal cancer | HMDB | 19006102   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 19006102   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 19167006   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 19573517   | 
| Human Breath | Detected but not Quantified |  |  |  |  |  | Children (1-13 years old) | Not Specified | Asthma | HMDB | 19793086   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 20055983   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21280206   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21280206   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21280206   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Newborn (0-30 days old) | Both | Normal | HMDB | 21386183   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21386183   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 21494609   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Irritable bowel syndrome | HMDB | 21761941   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21761941   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Ulcerative colitis | HMDB | 21761941   | 
| Human Feces | Detected and Quantified |  |  | 0 | 56788.237 | nmol/g wet feces | Children (1-13 years old) | Not Specified | Normal | HMDB | 21970810   | 
| Human Feces | Detected and Quantified |  |  | 0 | 149026.56 | nmol/g wet feces | Children (1-13 years old) | Not Specified | Treated celiac disease | HMDB | 21970810   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Infant (0-1 year old) | Not Specified | Genetically At-Risk of celiac disease | HMDB | 22432018   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Nonalcoholic fatty liver disease (NAFLD) | HMDB | 23454028   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 23454028   | 
| Human Feces | Detected and Quantified | 0.0122 |  | 0.00025 | 0.0173 | nmol/g wet feces | Infant (0-1 year old) | Not Specified | Crohns disease | HMDB | 23867873   | 
| Human Feces | Detected and Quantified | 0.00192 |  | 0.000045 | 0.0152 | nmol/g wet feces | Not Specified | Not Specified | Ulcerative colitis | HMDB | 23867873   | 
| Human Feces | Detected and Quantified | 0.00713 |  | 0.000942 | 0.0155 | nmol/g wet feces | Not Specified | Not Specified | Irritable bowel syndrome | HMDB | 23867873   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Crohn's disease | HMDB | 23867873   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Ulcerative colitis | HMDB | 23867873   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Colorectal cancer | HMDB | 23940645   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 23940645   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Colorectal cancer | HMDB | 23940645   | 
| Human Feces | Detected and Quantified | 6350 | 3130 |  |  | nmol/g wet feces | Adult (>18 years old) | Female | Normal | HMDB | 23997757   | 
| Human Urine | Detected and Quantified | 1.6 |  | 0.5 | 4 | umol/mmol creatinine | Adult (>18 years old) | Both | Normal | HMDB | 24023812   | 
| Human Urine | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 24023812   | 
| Human Breast milk | Detected and Quantified | 192 | 149 |  |  | uM | Adult (>18 years old) | Female | Normal | HMDB | 24027187   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Children (1-13 years old) | Both | Autism | HMDB | 24130822   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Children (1-13 years old) | Both | Pervasive Developmental Disorder Not Otherwise Specified  | HMDB | 24130822   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Children (1-13 years old) | Both | Normal | HMDB | 24130822   | 
| Human Saliva | Detected and Quantified | 130 | 270 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 110 | 300 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 110 | 310 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 170 | 600 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 130 | 250 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 70 | 140 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 80 | 120 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Infant (0-1 year old) | Both | Normal | HMDB | 24375085   | 
| Human Saliva | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Normal | HMDB | 24421258   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Immunoglobulin A nephropathy (IgAN) non progressor | HMDB | 24922509   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Immunoglobulin A nephropathy (IgAN) progressor | HMDB | 24922509   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 24922509   | 
| Human Feces | Detected and Quantified |  |  | 4440 | 11900 | nmol/g wet feces | Adult (>18 years old) | Both | Normal | HMDB | 25479871   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Crohns disease | HMDB | 25598765   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Ulcerative colitis | HMDB | 25598765   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 25598765   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 25670064   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Normal | HMDB | 25985090   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Crohns disease | HMDB | 26806034   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Ulcerative colitis | HMDB | 26806034   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 26806034   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Children (6 - <8 years old) | Female | juvenile idiopathic arthritis | HMDB | 27021336   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Colorectal Cancer | HMDB | 27107423   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 27107423   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Female | Interstitial cystitis | HMDB | 27188581   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | asymptomatic diverticulosis | HMDB | 27622378   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | symptomatic uncomplicated diverticular disease | HMDB | 27622378   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Normal | HMDB | 27622378   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 28587349   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Colorectal cancer | HMDB | 28587349   | 
| Human Urine | Detected and Quantified |  |  | 0.06 | 0.86 | umol/mmol creatinine | Newborn (0-30 days old) | Both | Normal | HMDB | 32340350   | 
| Human Urine | Detected and Quantified | 0.25 | 0.15 |  |  | umol/mmol creatinine | Newborn (0-30 days old) | Female | Normal | HMDB | 32340350   | 
| Human Urine | Detected and Quantified | 0.34 | 0.2 |  |  | umol/mmol creatinine | Newborn (0-30 days old) | Male | Normal | HMDB | 32340350   | 
| Human Blood | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 32966057   | 
| Human Urine | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 32966057   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 27065191   | 
| Human Blood | Detected and Quantified | 1 |  | 0.3 | 1.5 | uM | Adult (>18 years old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 165-177. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp., Basel, Switzerland c1981-1992. | 
| Human Cerebrospinal fluid (csf) | Detected and Quantified | 1.4 |  | 0 | 2.8 | uM | Adult (>18 years old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 165-177. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp., Basel, Switzerland c1981-1992. | 
| Human Saliva | Detected and Quantified | 18.3 | 13 |  |  | uM | Adult (>18 years old) | Not Specified | Normal | HMDB | Sugimoto, M., Saruta, J., Matsuki, C. et al. (2013) Physiological and environmental parameters associated with mass spectrometry-based salivary metabolomic profiles. Metabolomics, 9, 454–463 (2013). https://doi.org/10.1007/s11306-012-0464-y | 
| Human Saliva | Detected and Quantified | 13.3 | 12.8 |  |  | uM | Adult (>18 years old) | Not Specified | Normal | HMDB | Sugimoto, M., Saruta, J., Matsuki, C. et al. (2013) Physiological and environmental parameters associated with mass spectrometry-based salivary metabolomic profiles. Metabolomics, 9, 454–463 (2013). https://doi.org/10.1007/s11306-012-0464-y | 
| Human Saliva | Detected and Quantified | 277.27 | 199.47 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | https://doi.org/10.1007/s11306-015-0840-5 | 
| Human Saliva | Detected and Quantified | 12.5 | 8.39 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | Sugimoto, M., Saruta, J., Matsuki, C. et al. (2013) Physiological and environmental parameters associated with mass spectrometry-based salivary metabolomic profiles. Metabolomics, 9, 454–463 (2013). https://doi.org/10.1007/s11306-012-0464-y | 
| Human Saliva | Detected and Quantified | 20.5 | 16.5 |  |  | uM | Adult (>18 years old) | Both | Dental caries | HMDB | Sugimoto, M., Saruta, J., Matsuki, C. et al. (2013) Physiological and environmental parameters associated with mass spectrometry-based salivary metabolomic profiles. Metabolomics, 9, 454–463 (2013). https://doi.org/10.1007/s11306-012-0464-y | 
| Human Saliva | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | https://doi.org/10.1007/s11306-015-0840-5 | 
| Human Urine | Detected and Quantified | 4.002 | 2.176 |  |  | umol/mmol creatinine | Children (1 - 13 years old) | Not Specified | Normal | HMDB | Analysis of 30 normal pediatric urine samples via NMR spectroscopy (unpublished work) | 
| Human Urine | Detected and Quantified | 4.256 | 3.945 |  |  | umol/mmol creatinine | Children (1 - 13 years old) | Not Specified | Eosinophilic esophagitis | HMDB | Analysis of 30 normal pediatric urine samples via NMR spectroscopy (unpublished work) | 
| Human Urine | Detected and Quantified | 3.2 |  | 0 | 6.4 | umol/mmol creatinine | Infant (0-1 year old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 130. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp. Basel, Switzerland c1981-1992. | 
| Human Urine | Detected and Quantified | 42 |  | 21 | 81 | umol/mmol creatinine | Adult (>18 years old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 130. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp. Basel, Switzerland c1981-1992. | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Female | Myalgic encephalomyelitis/chronic fatigue syndrome | HMDB | Christopher W. ArmstrongNeil R. McGregorDonald P. LewisHenry L. ButtPaul R. Gooley. The association of fecal microbiota and fecal, blood serum and urine metabolites in myalgic encephalomyelitis/chronic fatigue syndrome. Metabolomics.  January 2017, 13:8 | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Female | Normal | HMDB | Christopher W. ArmstrongNeil R. McGregorDonald P. LewisHenry L. ButtPaul R. Gooley. The association of fecal microbiota and fecal, blood serum and urine metabolites in myalgic encephalomyelitis/chronic fatigue syndrome. Metabolomics.  January 2017, 13:8 | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Female | Normal | HMDB | Mette S. SchmedesChristian C et al. Impact of a 6-week very low-calorie diet and weight reduction on the serum and fecal metabolome of overweight subjects. European Food Research and Technology. March 2015, Volume 240, Issue 3, pp 583–594 | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Colorectal cancer | HMDB | Silke Matysik, Caroline Ivanne Le Roy, Gerhard Liebisch, Sandrine Paule Claus. Metabolomics of fecal samples: A practical consideration. Trends in Food Science & Technology. Vol. 57, Part B, Nov. 2016, p.244-255 | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Normal | HMDB | Silke Matysik, Caroline Ivanne Le Roy, Gerhard Liebisch, Sandrine Paule Claus. Metabolomics of fecal samples: A practical consideration. Trends in Food Science & Technology. Vol. 57, Part B, Nov. 2016, p.244-255 | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Female | ankylosing spondylitis | HMDB | Tie-juan ShaoZhi-xing HeZhi-jun XieHai-chang LiMei-jiao WangCheng-ping Wen. Characterization of ankylosing spondylitis and rheumatoid arthritis using 1H NMR-based metabolomics of human fecal extracts. Metabolomics. April 2016, 12:70 | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Female | rheumatoid arthritis | HMDB | Tie-juan ShaoZhi-xing HeZhi-jun XieHai-chang LiMei-jiao WangCheng-ping Wen. Characterization of ankylosing spondylitis and rheumatoid arthritis using 1H NMR-based metabolomics of human fecal extracts. Metabolomics. April 2016, 12:70 | 
| Human Urine | Detected and Quantified | 0.18  |  0.044 |  |  | umol/mmol creatinine | Adult (>18 years old) | Both | AIDS | HMDB | 9071566   | 
| Human Feces | Detected and Quantified |  |  | 0 | 149026.560 | nmol/g wet feces | Children (1-13 years old) | Not Specified | Treated celiac disease | HMDB | 21970810   | 
| Human Feces | Detected and Quantified | 0.0122  |  | 0.000250 | 0.0173 | nmol/g wet feces | Infant (0-1 year old) | Not Specified | Crohns disease | HMDB | 23867873   | 
| Human Feces | Detected and Quantified | 0.00713  |  | 0.000942 | 0.0155 | nmol/g wet feces | Not Specified | Not Specified | Irritable bowel syndrome | HMDB | 23867873   | 
| Human Feces | Detected and Quantified | 0.00192  |  | 0.000045 | 0.0152 | nmol/g wet feces | Not Specified | Not Specified | Ulcerative colitis | HMDB | 23867873   | 
| Human Feces | Detected and Quantified |  |  | 0 | 56788.237 | nmol/g wet feces | Children (1-13 years old) | Not Specified | Normal | HMDB | 21970810   | 
| Human Urine | Detected and Quantified |  |  | 0.06 | 0.86 | umol/mmol creatinine | Newborn (0-30 days old) | Both | Normal | HMDB | 32340350   | 
| Human Urine | Detected and Quantified | 0.131  |  0.013 |  |  | umol/mmol creatinine | Adult (>18 years old) | Both | Normal | HMDB | 9071566   | 
| Human Urine | Detected and Quantified | 0.25  |  0.15 |  |  | umol/mmol creatinine | Newborn (0-30 days old) | Female | Normal | HMDB | 32340350   | 
| Human Urine | Detected and Quantified | 0.34  |  0.20 |  |  | umol/mmol creatinine | Newborn (0-30 days old) | Male | Normal | HMDB | 32340350   | 
| Human Urine | Detected and Quantified | 1.6  |  | 0.5 | 4.0 | umol/mmol creatinine | Adult (>18 years old) | Both | Normal | HMDB | 24023812   | 
| Human Saliva | Detected and Quantified | 110  |  300 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 110  |  310 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Feces | Detected and Quantified | 12400  |  | 4000 | 53000 | nmol/g wet feces | Adult (>18 years old) | Both | Normal | HMDB | 6740214   | 
| Human Saliva | Detected and Quantified | 130  |  250 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 130  |  270 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 1470  |  | 0.00 | 2940 | uM | Adult (>18 years old) | Both | Normal | HMDB | 12097436   | 
| Human Saliva | Detected and Quantified | 170  |  600 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Breast milk | Detected and Quantified | 192  |  149 |  |  | uM | Adult (>18 years old) | Female | Normal | HMDB | 24027187   | 
| Human Feces | Detected and Quantified |  |  | 4440 | 11900 | nmol/g wet feces | Adult (>18 years old) | Both | Normal | HMDB | 25479871   | 
| Human Feces | Detected and Quantified | 6350  |  3130 |  |  | nmol/g wet feces | Adult (>18 years old) | Female | Normal | HMDB | 23997757   | 
| Human Saliva | Detected and Quantified | 70  |  140 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Saliva | Detected and Quantified | 80  |  120 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | 24246267   | 
| Human Urine | Detected and Quantified | 4.256 | 3.945 |  |  | umol/mmol creatinine | Children (1 - 13 years old) | Not Specified | Eosinophilic esophagitis | HMDB | Analysis of 30 normal pediatric urine samples via NMR spectroscopy (unpublished work) | 
| Human Urine | Detected and Quantified | 4.002 | 2.176 |  |  | umol/mmol creatinine | Children (1 - 13 years old) | Not Specified | Normal | HMDB | Analysis of 30 normal pediatric urine samples via NMR spectroscopy (unpublished work) | 
| Human Blood | Detected and Quantified | 1.0 |  | 0.3 | 1.5 | uM | Adult (>18 years old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 130. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp. Basel, Switzerland c1981-1992. | 
| Human Cerebrospinal fluid (csf) | Detected and Quantified | 1.4 |  | 0 | 2.8 | uM | Adult (>18 years old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 130. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp. Basel, Switzerland c1981-1992. | 
| Human Urine | Detected and Quantified | 3.2 |  | 0.0 | 6.4 | umol/mmol creatinine | Infant (0-1 year old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 130. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp. Basel, Switzerland c1981-1992. | 
| Human Urine | Detected and Quantified | 42.0 |  | 21.0 | 81.0 | umol/mmol creatinine | Adult (>18 years old) | Both | Normal | HMDB | Geigy Scientific Tables, 8th Rev edition, pp. 130. Edited by C. Lentner, West Cadwell, N.J.: Medical education Div., Ciba-Geigy Corp. Basel, Switzerland c1981-1992. | 
| Human Saliva | Detected and Quantified | 12.5 | 8.39 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | Sugimoto et al. (2013) Physiological and environmental parameters associated with mass spectrometry-based salivary metabolomic profiles.  | 
| Human Saliva | Detected and Quantified | 13.3 | 12.8 |  |  | uM | Adult (>18 years old) | Not Specified | Normal | HMDB | Sugimoto et al. (2013) Physiological and environmental parameters associated with mass spectrometry-based salivary metabolomic profiles.  | 
| Human Saliva | Detected and Quantified | 18.3 | 13.0 |  |  | uM | Adult (>18 years old) | Not Specified | Normal | HMDB | Sugimoto et al. (2013) Physiological and environmental parameters associated with mass spectrometry-based salivary metabolomic profiles.  | 
| Human Saliva | Detected and Quantified | 277.27 | 199.47 |  |  | uM | Adult (>18 years old) | Both | Normal | HMDB | https://doi.org/10.1007/s11306-015-0840-5 | 
| Human Fibroblasts | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 34986597   | 
| Human Intestine | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 34986597   | 
| Human Kidney | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 34986597   | 
| Human Neuron | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 34986597   | 
| Human Prostate | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 34986597   | 
| Human Skeletal muscle | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 34986597   | 
| Human Urine | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 24023812   | 
| Human Saliva | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Normal | HMDB | 24421258   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 17314143   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 18052033   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 18085514   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 19006102   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 19167006   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 19573517   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 20055983   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21280206   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21280206   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21280206   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Newborn (0-30 days old) | Both | Normal | HMDB | 21386183   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21386183   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Not Specified | Not Specified | Normal | HMDB | 21494609   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 21761941   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 23454028   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 23940645   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Infant (0-1 year old) | Both | Normal | HMDB | 24375085   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 25670064   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 17269711   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Children (1-13 years old) | Both | Normal | HMDB | 24130822   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 24922509   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 25598765   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 26806034   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 27065191   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 27107423   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Normal | HMDB | 27622378   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Not Specified | Normal | HMDB | 25985090   | 
| Human Feces | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 28587349   | 
| Human Urine | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 32966057   | 
| Human Blood | Detected but not Quantified |  |  |  |  |  | Adult (>18 years old) | Both | Normal | HMDB | 32966057   |