The actual amount of curcumin in turmeric varies from species to species, growing conditions, and timing of growth and harvest. (whfoods.org)
I didn't read through all of the comments so this has probably already been said, but as well as the bioavailabilty of curcumin in turmeric increasing substantially in the presence of oil, adding fresh black pepper is recommended too. (101cookbooks.com)
Curcumin in turmeric reverses liver damage and maximizes liver health, making your liver better at removing estrogen from your body. (chestsculpting.com)