Info :
The grapefruit tree is an evergreen tree with glossy leaves and delicately scented, white flowers that give way to large, golden fruit. The peel of the grapefruit is bursting with small glands filled with essential oil. 
 
Details: 
Botanical Name : Citrus paradisi
Family : Rutaceae
Country of Origin  :  Mexico  
Extraction Method  : Cold Pressed 
Plant Part Used  : Peel 
Note  : Top Note  
Aroma : Citrus, fresh, sweet
Color : Clear to pale yellow 
Blends well With :  Florals, citrus and woods  
Shelf Life : 4 – 5 Years
 
Safety
Possible Photosensitizing 
Skin sensitization if oxidized.
The maximum dermal use level is 4%;
Skin must not be exposed to sunlight or sunbed rays for 12 hours, 
A patch test should be performed before use for those with sensitive skin.
For topical application don’t use directly on skin, dilute with a carrier oil
Discontinue use if skin sensitivity occurs
Add 4-5 drops for Diffusing
Don’t ingest
Keep out of reach of children , Avoid using if pregnant or nursing
 
References:
Essential oil safety ( Tisserand and young ) second Edition
Charles Fetrow & Julian Avila (2000) The Complete Guide to Herbal Medicine
https://www.foodchemicalscodex.org/
Lawrence BM, Essential oils from Agriculture to Chemistry
The Complete Guide to Aromatherapy, Salvatore Battaglia