.

The Healthiest Lettuce

Most antioxidant:
  1. Red leaf
  2. Green leaf
  3. Iceburg

Source:

D. Boivin, S. Lamy, S. Lord-Dufour, J. Jackson, E. Beaulieu, M. Cote, A. Moghrabi, S. Barrette, D. Gingras, and R. Beliveau. Antiproliferative and antioxidant activities of common vegetables: A comparative study. Food Chem., 112(2):374{380, 2009.