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Evening Primrose

Evening primrose oil is extracted from the evening primrose plant (oenothera biennnis), a wildflower found in north America, Europe and parts of Asia. Evening primrose plant will bloom throughtout the summer buts its power each last only one day--opening as the sun goers down and then dying away in sunlight, hence it's name " Evening primrose Oil".

This flower contains substantial amount of polysaturated omega-6 fatty acids, essential fatty acids (EFAs) which very needed by the body to regulate a number of activities including insulin utilization, hearth function and mood. Since the body doesn't produce EFAs they must be ingested through proper diet or supplementation. In addition to omega-6 fatty acid, evening primrose oil contains linoleic acid and gamma-linolenic acid (GLA). Both linoleic acid and GLA are believed to have very positive health and medicinal indications. Linoleic acid may affect how the body utilizes insulin, maintains weight, and fights cancer and heart disease. GLA may help to inhibit the body's production of chemicals that cause inflammation.

Petroleum (L. petroleum, from Greek πετρέλαιον, lit. "rock oil", first used in the treatise De Natura Fossilium published in 1546 by the German mineralogist Georg Bauer, known as Georgius Agricola^[1]) or crude oil is a naturally occurring, flammable liquid found in rock formations in the Earth consisting of a complex mixture of hydrocarbons of various molecular weights, plus other organic compounds.
The proportion of hydrocarbons in the mixture is highly variable and ranges from as much as 97% by weight in the lighter oils to as little as 50% in the heavier oils and bitumens.The hydrocarbons in crude oil are mostly alkanes, cycloalkanes and various aromatic hydrocarbons while the other organic compounds contain nitrogen, oxygen and sulfur, and trace amounts of metals such as iron, nickel, copper and vanadium. The exact molecular composition varies widely from formation to formation but the proportion of chemical elements vary over fairly narrow limits as follows:^[2]

Composition by weight

Element	Percent range
Carbon	83 to 87%
Hydrogen	10 to 14%
Nitrogen	0.1 to 2%
Oxygen	0.1 to 1.5%
Sulfur	0.5 to 6%
Metals	less than 1000 ppm

Four different types of hydrocarbon molecules appear in crude oil. The relative percentage of each varies from oil to oil, determining the properties of each oil.^[3]

Composition by weight

Hydrocarbon	Average	Range
Paraffins	30%	15 to 60%
Naphthenes	49%	30 to 60%
Aromatics	15%	3 to 30%
Asphaltics	6%	remainder

(WIKIPEDIA.COM)