Certain features of will be down for maintenance Saturday afternoon/evening, February 24th starting at 3:00 pm CT until 9:00 pm CT.

Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Life Science


Sigma is the world leader in biochemicals, including antibiotics, nucleotides, proteins, peptides, polyamino acids, buffers, lipids, carbohydrates and antibodies used in fundamental research. Our Enzyme Explorer is the most comprehensive source for enzymes, substrates, activators, and inhibitors. At Sigma, you'll find the products and knowledge to help you reach your ultimate goals.

Information & News
The Bioactive Nutrient Explorer is organized to help you search over 1,200 compounds by multiple classifications, including:
  • Botanical Source
  • Structural Families
  • Coming Soon - Physiological/Therapeutic Action
Bioactive Nutrient Explorer