Oenothera biennis (common evening-primrose, evening star, or sun drop) is a species of Oenothera native to eastern and central North America, from Newfoundland west to Alberta, southeast to Florida, and southwest to Texas, and widely naturalized elsewhere in temperate and subtropical regions. Evening primrose oil is produced from the plant.
Light yellow oily liquid with the flavour of primrose, soluble in 70% of the ethanol and other organic matter.
Character ligh yellow oily liquidSpecific Gravity 0.915~0.935
Optical Rotation 1.470~1.482
Acid Value ≤2.5(mgkOH/g )
Iodine Value 135~164
Peroxide Value <2.4ml
Heavy Metal ≤1.0PPm
Evening primrose is considered to have beneficial health effects, largely due to its GLA content. Evening primrose is sometimes used to treat eczema. The Cochrane Collaboration conducted a meta analysis of clinical trials studying the effect of orally administered evening primrose oil on eczema and concluded that there was no effect. The Mayo clinic examined evidence for the safety and effectiveness of evening primrose for several conditions; it was considered that there was good evidence (grade B, vs "strong evidence", grade A) that it produced a moderate improvement in eczema. Grade C, unclear, evidence for benefit is listed for many conditions, including some reduction of blood pressure.
Evening Primrose Oil is considered likely to be safe in recommended doses. It may increase the risk of bleeding, a concern for patients with bleeding disorders or taking drugs that may increase bleeding. The Mayo clinic recommends caution in people with seizure disorders or mania, and by pregnant or breastfeeding women, and publishes a long list of possible side-effects.
G.I. drums of 50kg/180kg net.