Olive Leaf Extract
Olive leaf extract comes from the leaves of olive plants,the leaf extract contains phenolics such as oleuropein, and appears to have highly protective effects against LDL oxidation and may also benefit glucose metabolism and skin health. Traditional usage seems to be localized to around the mediterranean area (Spain, Italy, France, Greece, Israel, Morrocco, Tunisia, Turkey) and in Africa by the Sotho, Xhosa, and Zulu tribes where it holds high importance
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Specification: 8%~40% Oleuropein; 5%~40% Hydroxytyrosol
Botanical name: Olive leaf
Characters: Powder
Color: Brown
Odour: Characteristic
Mesh: 80
Solubility: Soluble in water and ethanol
Loss on drying % : ≤5.0%
Product components
Olive leaf extracts tend to contain:
Oleuropein, commonly seen as the main bioactive and in studies is commonly standardized to 18-22% of the supplement while consisting of around 60-90mg/g (6-9%) of the leaf by dry weight
Tyrosol,, hydroxytyrosol and dihydroxytyrosol; olives appear to have a small salidroside component (main bioactive of Rhodiola Rosea)
Elenolic acid (sometimes at levels that are unquantifiable) and its glucoside oleoside and the latter’s 11-methyl ester
Oleacein (fully known as 2-(3,4-dihydroxyphenyl)ethyl 4-formyl-3-(2-oxoethyl)-4 E-hexenoate)
Oleanolic acid, maslinic acid, and some Ursolic Acid (this study noting African sourced leaves only) in about a 1:1 ratio or oleanolic:ursolic sometimes called oleuafricein at 0.27% of the leaves dry weight with total oleanolic acid ranging from 0.71-2.47%; these pentacyclic terpenoids are common to anti-diabetic plants
Ligstroside
Excelcioside
Lucidumoside C
Loleuropeindiale and oleuropeindiale
Quercetin at 0.04% and Rutin
Kaempferol and aromadendrin (Dihydrokaempferol)
Apigenin with its 7-O-glucoside at 0.07%
Luteolin with its 7-O-glucoside at 0.04%
Vanillin and vanillic acid
Chlorophyll
Tannin structures (0.52%)
Verbascoside as the most prominent hydroxycinnamic acid derivative
Caffeic acid (0.02%) noted to be higher in green and cherry olives relative to black with hydroxycaffeic acid present
Recommended dosage
Supplemental olive leaf is taken in the 500-1000mg range daily, although supplements with even as low as 10mg (as seen in olive oil products) may confer good protection against LDL oxidation. At least for LDL oxidation, olive food products may suffice rather than supplementation.