However, while these studies may show that limonoids in foods such as grapefruit may offer some protection from cancer, these were test tube studies and clinical studies need to be conducted before claims can be made. (healthyeating.sfgate.com)
Given its active phytonutrients called limonoids and lycopene, grapefruit inhibits tumor formation by supporting the production of a key detoxifying enzyme, which is responsible for eliminating metabolized toxins from your system. (detoxdiy.com)
A similar study, also published in Food and Function in 2013, found that limonoids also reduced the development of breast cancer cells. (healthyeating.sfgate.com)