| D-Glucose | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| Glycine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Fructose 6-phosphate | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| Glutathione | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Glycerol 3-phosphate | Chemical entities | Organic compounds | Lipids and lipid-like molecules | Glycerophospholipids | Details |
| D-Glucuronic acid | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| Guanidoacetic acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Homogentisic acid | Chemical entities | Organic compounds | Benzenoids | Benzene and substituted derivatives | Details |
| Glycerol | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Guanine | Chemical entities | Organic compounds | Organoheterocyclic compounds | Imidazopyrimidines | Details |
| Guanosine | Chemical entities | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleosides | Details |
| Glyceric acid | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| Glucosylceramide | Chemical entities | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Details |
| Formic acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Carboxylic acids | Details |
| Estrone | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Estrane steroids | Details |
| L-Glutamic acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Ethanolamine | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Amines | Details |
| Gluconolactone | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| Estradiol | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Estrane steroids | Details |
| Estriol | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Estrane steroids | Details |
| Hypoxanthine | Organic compounds | Organoheterocyclic compounds | Imidazopyrimidines | Purines and purine derivatives | Details |
| L-Tyrosine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| L-Phenylalanine | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| L-Alanine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| L-Proline | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| D-Maltose | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| Methylamine | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Amines | Details |
| L-Threonine | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| L-Asparagine | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| D-Mannose | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |