William's E Medium was originally developed by Williams and Gunn as reduced serum-supplemented medium for long-term cell cultures of adult rat liver epithelial cells. Gibco™ William's E Medium can also be used for growing primary hepatocyte cells of different species as well as human derived HepaRG cells.


The complete formulation is available.

Gibco William's E Medium is a modification of earlier media that has been enriched in amino acids and double the glucose. William's E Medium contains unique ingredients, including zinc, iron, manganese, non-essential amino acids, the reducing agent glutathione and the lipid methyl linoleate

Dual-Site cGMP Manufacturing
For supply chain continuity, we manufacture Gibco William's E Medium at two separate facilities located in Grand Island, NY and Scotland, UK. Both sites are compliant with cGMP manufacturing requirements, are certified to ISO 13485, and are registered with the FDA as medical device manufacturers.

William's E Medium contains no proteins or growth factors. Therefore, William's E Medium requires supplementation, commonly with 5-10% Fetal Bovine Serum (FBS). William's E Medium uses a sodium bicarbonate buffer system (2.2 g/L) and therefore requires a 5-10% CO₂ environment to maintain physiological pH.