Dosage Information

Grapefruit is usually taken as whole fresh grapefruit, 100% grapefruit juice, freeze-dried whole grapefruit powder, or grapefruit seed extract.

When fresh grapefruit, grapefruit juice, and freeze-dried grapefruit capsules were directly compared in one study, fresh grapefruit seemed the most promising for various cardiometabolic outcomes. However, the only effect that reached statistical significance was weight loss.^[4]

Most studies have provided one-half of a fresh grapefruit or an 8-oz glass of grapefruit juice three times a day before meals. When it was reported, the daily dose of naringenin (the major flavonoid in grapefruit) has ranged from 81 to 142 mg daily.^[5][6]

For regular dietary intake, the US Dietary Guidelines suggest consuming whole fruit over juice, but either one can help you meet the recommended 2 cups of fruit per day.