Grapefruit

Grapefruit is a rich source (>20% of the Daily Value, DV in a 100 gram serving) of vitamin C,[20][25] contains the fiber pectin,[26] and the pink and red hues contain the beneficial antioxidant lycopene.[20][27]

Studies have shown grapefruit helps lower cholesterol,[20][28] and there is evidence that the seeds have antioxidant properties.[29] Grapefruit forms a core part of the "grapefruit diet", the theory being that the fruit's low glycemic index is able to help the body's metabolism burn fat.[30]

Grapefruit seed extract (GSE) has been shown to have strong antimicrobial properties against fungi.[31] It is also believed to have antimicrobial properties for bacteria; however, there are no known studies that demonstrate its efficacy.

Additionally, although GSE is promoted as a highly effective plant-based preservative by some natural personal care manufacturers, studies have shown that the apparent antimicrobial activity associated with GSE preparations is merely due to contamination with synthetic preservatives