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| Company Name | Tel | Country/Region | Contact |
| Cambridge Isotope Laboratories, Inc. | 978 749-8000 | United States | |
| Cooper Chemical Company | 908 876-3231 | United States | |
| Cayman Chemical Company | (734) 971-3335 | United States | |
| Chriskev Company, Inc. | (913) 491-4911 | United States | |
| Chemlex Pharmaceuticals LLC | 925 789-0388 | United States | |
| CASOrganic Company | 973 742-5802 | United States | |
| Creative Diagnostics | United States | ||
| Changsha staherb natural ingredients co.,ltd | 186/73256268 | China | |
| Creative Proteomics | (631) 593-0501 | United States | |
| Creative Enzymes | 1-516-855-7709 | United States | |
| Chemvon Biotechnology Co., LTD. | +86-21-31268550 | China | |
| Cangzhou Enke Pharma-tech Co.,Ltd | 0086-0317-5106598 | China | |
| Chemtarget Technologies Co.,Ltd., | 0086-0816-2541516 | China | |
| Changzhou Naide Chemical Co.,Ltd | 0519-82860351 | China | |
| Changzhou Healthy Chemicals Co.,Ltd | 0519-82090630 | China | |
| Chengdu Baishixing Science and Technology Industry Co., Ltd | 86+18328356827 | China | |
| China Skyrun Industrial CO.,LTD | 057684015261 | China | |
| Chengdu Push Bio-Technology Co., Ltd. | 86-15882343429 | China | |
| Conscientia Industrial Co., Ltd. | +86170-9858-0209 | China | |
| Carbott Pharm Tech Inc. | 8605356385396 | China | |
| Clearsynth Labs | +91-9167491167 | India | |
| Clearsynth | +1.415.685.4395 | United States | |
| Creative-Peptides | United States | ||
| Chongqing Land Tower Pharmaceutical Co., Ltd | +86-23-68980308 | China | |
| ChemReach Inc. | 201 444 7956 | United States | |
| ChemieTek | 317 598 0828 | United States | |
| Chemoraga, Inc. | 510 215-6706 | United States | |
| Chembest LLC | (760) 705-0978 | United States | |
| ChemALong Laboratories, LLC | 630 257-9683 | United States | |
| CreaGen Biosciences | 781 938-1122 | United States |