13C Metabolic Probes 27 15N Salts 18 a-Keto Acids 40 Amine Hormones 28 Amino Acids 714 Basic Starting Materials 371 Bile Acids 157 Biochemical Pathways 325 Biological Standards 370 Buffers, Reagents, Lipids and Detergents 63 Carbohydrates 188 Carnitines/Acylcarnitines 79 Cell-Free Protein Expression 14 Cell Growth Media and Protein Production 109 cGMP 13 Chemical Tagging Reagents and Related Products 126 Chemical Weapon Metabolite Standards 73 Cholesterol 17 Clearance Items 17 Corticosteroids 29 Cyanotoxin Standards 11 ISOAPI-D - Deuterated Reagents for Pharmaceuticals 98 Deuterium Gas and Stable Isotopes for Semiconductor and Fiber Optics Manufacturing 31 Dioxin and Furan Individual Standards 252 Dioxin and Furan Method Standards, Standard Mixtures, and Reference Materials 352 Dioxin, Furan, PCB Standard Mixtures 10 Drug Standards 36 Elements and Compounds 44 Fatty Acids and Lipids 353 Flame Retardants 253 Free Amino Acids 433 Gases 146 Glycan Standards 123 ISOLED-D Deuterated Reagents for OLED Synthesis 46 Key Metabolite Standards 29 Metabolites and Substrates 360 Metabolomics and Cellular Metabolism 169 Metabolomics Mixes and Kits 79 Microbiological and Pyrogen Tested (MPT) 111 Minimal Media Reagents 26 MRI/MRS Products 69 MS/MS Screening Standards and Mixes 227 Neurotransmitters 39 NMR Solvents and Consumables 337 Nucleic Acids 383 Organic Acids and Conjugate Salts 159 PCB Standards and Standard Mixtures 887 Per- and Polyfluoroalkyl Substances (PFAS) 168 Pesticides, Herbicides, and Metabolites Standards 535 Pharmaceuticals and Personal Care Products (PPCPs) 279 Phthalate and Phthalate Metabolite Standards 99 Polycyclic Aromatic Hydrocarbon (PAH) Standards and Standard Mixtures 314 Priority Pollutant, Endocrine Disruptor, and Chemical Contaminant Standards 1129 Priority Pollutant Standard Mixtures 60 Prostaglandins 1 Protected Amino Acids 133 Protein Reagents 24 Protein Standards 39 Peptiquant Plus Kits 74 Products for Research Applications 4004 Sex Hormones 81 SILAC Reagents and Sets 55 SILAM 21 Special Offers 128 Spirulina 9 Products 7939 Environmental Standards 3623 Steroids and Hormones 414 Stockholm Treaty Standards 304 Synthetic Intermediates 742 Thyroid Hormones 7 UBT Urea 1 US EPA UCMR Method Standards 10 Vitamins 144 Water 13

0 - 100 18

15N 17 18O 1

Partially 4 Uniformly 14

0%-9% 2 10%-19.9% 6 90%-97.9% 1 98%-98.9% 5 99%-99.9% 4

CTM 1 Research 17

0-100 g/mol 10 101-200 g/mol 8

Individual 18