Citrus Fruits
Oranges, lemons, limes, and grapefruits all have important nutrients like vitamin C, folate, and fiber, but what makes citrus fruits unique is the high level of the phytochemical known as limonoid, which is effective against tumor growth. Limonoid is considered a good candidate for human trial in chemoprevention and a metabolite of limonene, perillyl alcohol, is currently undergoing Phase I clinical trials in patients with advanced malignancies (Ripple et. al.).