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Product detailsProduct name: Evening primrose extractLatin name:Oenothera erythrosepala BorbPlant used:HerbSpecification:5:1 10:1 201Test method: HPLC  UV Introduction of Evening primrose extract :Evening Primrose is a plant in North American native biennial . The plants are so tall, that often 4 to 5 feet or more. The flower grow on auxiliary branches all around the stalk. They are 2-1/2 inched in each diameter, bright yellow and they have four petal .Evening primrose extract is also called oenothera biennis,which is found in this century the most important nutrition drugs.onagre bisannuelle