History:
The true home of the lemon is unknown; some believes it belongs to northwestern India. It was southern Italy in 200 A.D. and to have been cultivated in Iraq and Egypt Arabs distributed it widely in the Mediterranean region between 1000 and 1150 A.D. It was well known for its medicinal virtues in the palace of the Sultan of Egypt Christopher Columbus carried lemon seeds to Hispaniola in 1493. 
 
Details:
Botanical Name : Citrus lemon 
Family: Rutaceae
Country of Origin: Argentina 
Extraction Method: Cold Pressed 
Plant Part Used: Peel of  Fruit 
Note: Top note  
Aroma: Citrusy , fresh, green   
Color: Pale yellow 
Blends well With Most essential oils  
Shelf Life: 4 – 5 Years 
 
Safety 
Potential photosensitizer, recommend usage 2 % 
if applied to the skin over maximum dermal use level, skin must not be exposed to sunlight or sunbed rays for 12 hours. Old or oxidized oils should be avoided.10 Dilute before using. A patch test should be performed before use for those with sensitive skin.
Can cause skin irritation 
For topical application don’t use directly on the 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
Arcatender Perfume and flavor materials of natural origin