A highly rated spinach leaf extract brands is Swanson Green Foods. The manufacturer claims that each capsule contains 750 milligrams of spinach leaf extract. Another spinach extract brand is Nature's Vision.
According to a study from Lund University, spinach leaf extract is beneficial in curbing food cravings and aiding in weight loss. Spinach leaves contain membranes called thylakoids that are responsible for quieting food cravings by over 90 percent. Thylakoids help with food cravings known as hedonic hunger, which are cravings for carb and sugar rich foods. Ingesting spinach leaf extract on a daily basis can result in a 40 percent increase in weight loss, states the study.