Beta-sitosterol

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Overview

Beta-sitosterol is a plant sterol, also known as a phytosterol, which is structurally similar to cholesterol. Beta-sitosterol differs from cholesterol by the presence of an extra ethyl group. It is found in a variety of plant-based foods, including fruits, vegetables, nuts, and seeds. This compound has garnered significant attention due to its potential health benefits, particularly in the areas of cholesterol management, prostate health, and immune function.

SOURCES

Beta-sitosterol is naturally present in many foods, making it relatively easy to incorporate into a balanced diet. Some of the richest sources include:

Nuts and Seeds: Almonds, peanuts, sunflower seeds, and sesame seeds.
Vegetable Oils: Corn oil, soybean oil, and olive oil.
Legumes: Beans, lentils, and peas.
Fruits and Vegetables: Avocados, berries, and broccoli.

Additionally, beta-sitosterol is available as a dietary supplement, often marketed for its potential health benefits.

Health Benefits of Beta-Sitosterol

Cholesterol Management

One of the most well-documented benefits of beta-sitosterol is its ability to help manage cholesterol levels. Beta-sitosterol competes with cholesterol for absorption in the digestive system, which can lead to a reduction in overall cholesterol levels. Studies have shown that regular consumption of beta-sitosterol can lower LDL (low-density lipoprotein) cholesterol, often referred to as "bad" cholesterol, without affecting HDL (high-density lipoprotein) cholesterol, or "good" cholesterol.

Prostate Health

Beta-sitosterol is also known for its potential benefits in supporting prostate health. It is commonly used in the treatment of benign prostatic hyperplasia (BPH), a condition characterized by an enlarged prostate gland. Research suggests that beta-sitosterol can improve urinary symptoms and flow measures in men with BPH. It is believed to work by inhibiting the production of dihydrotestosterone (DHT), a hormone that contributes to prostate growth.

Immune Function

Emerging research indicates that beta-sitosterol may have a positive impact on immune function. It is thought to modulate the immune response, potentially enhancing the body's ability to fight off infections and diseases. Some studies have shown that beta-sitosterol can increase the activity of natural killer cells, which play a crucial role in the body's defense against viruses and cancer cells.

Mechanism of Action

Beta-sitosterol's effects on cholesterol absorption are primarily due to its structural similarity to cholesterol. When consumed, beta-sitosterol competes with cholesterol for incorporation into micelles in the intestine, reducing the amount of cholesterol that is absorbed into the bloodstream. This competition leads to an increase in cholesterol excretion and a decrease in blood cholesterol levels.

In terms of prostate health, beta-sitosterol is believed to inhibit the enzyme 5-alpha-reductase, which converts testosterone to DHT. By reducing DHT levels, beta-sitosterol may help to alleviate symptoms associated with BPH.

Dosage and Safety

The appropriate dosage of beta-sitosterol can vary depending on the intended use and individual health conditions. For cholesterol management, doses typically range from 1 to 3 grams per day. For prostate health, doses of 60 to 130 milligrams per day are commonly used.

Beta-sitosterol is generally considered safe for most people when taken in recommended amounts. However, some individuals may experience side effects such as gastrointestinal discomfort, nausea, or diarrhea. It is important to consult with a healthcare provider before starting any new supplement, especially for individuals with pre-existing health conditions or those taking other medications.

Articles/Studies

Cancer

Cardioprotective

The β-sitosterol-mediated cardioprotective effects may involve the modulation of PPARγ/NF-κB signalling during myocardial I/R injury.

Diabetes

Discovery of β-sitosterol's effects on molecular changes in rat diabetic wounds and its impact on angiogenesis and macrophages.

Gastrointestinal

β-sitosterol alleviates dextran sulfate sodium-induced experimental colitis.

Hepatoprotective

Renoprotective

The targets of β-sitosterol as a novel therapeutic against cardio-renal complications in acute renal ischemia/reperfusion damage.

Other Effects

From Duke's Database

Biological Activities

Androgenic

Angiogenic Reference: X11988857

Anorexic Reference: MAR

Antiadenomic Reference: M11

Antiandrogenic Reference: JE28:221

Antibacterial Reference: QJC28:155

Anticancer (Breast) Reference: PS131:95

Anticancer (Cervix) Reference: PJB1(2):287

Anticancer (Lung) Reference: PJB1(2):287

Antiedemic Dosage: IC54=320 mg/kg orl; Reference: DFN:160

Antiestrogenic Reference: JE28:221

Antifeedant Reference: 382

Antifertility Reference: JE28:221

Antigonadotrophic Reference: JE28:221

Antihyperlipoproteinaemic Reference: JBH

Antiinflammatory Reference: JE28:221 LRN1995

Antileukemic Reference: PJB1(2):287

Antilymphomic Reference: PJB1(2):287

Antimutagenic Dosage: 250 ug/ml; Reference: JAFC37:1365

Antiophidic Dosage: 2.3 mg mus; Reference: EMP5:363

Antioxidant Dosage: IC44=10 uM; Reference: JMF5:1

Antiprogestational Reference: JE28:221

Antiprostaglandin Dosage: 30 mg/day/12 wks; Reference: FT68(4):291

Antiprostatadenomic Reference: M11

Antiprostatitic Dosage: 10-20 mg 3 x/day/orl man; Reference: FT68(3):205 M29

Antipyretic Reference: HDN

Antitumor (Breast) Reference: PS131:95

Antitumor (Cervix) Reference: PJB1(2):287

Antitumor (Lung) Reference: PJB1(2):287

Antiviral Reference: PS75:161

Artemicide Dosage: LC50=110 ppm; Reference: PC29(5):1667

Cancer-Preventive Reference: 525

Candidicide Reference: QJC28:155

Estrogenic Reference: PHM9:52

Febrifuge Reference: HDN

Gonadotrophic Reference: JE28:221

Hepatoprotective Reference: PMP23:60

Hypocholesterolemic Dosage: 2-6 g/man/day/orl; Reference: M30 Dosage: 9-3,330 mg/man/day/orl; Reference: MAR

Hypoglycemic Reference: JE27:243

Hypolipidemic Dosage: 2-6 g/day; Reference: M30 M29

Spermicide Reference: JE28:221

Ubiquiot Reference: JBH

Ulcerogenic Dosage: 500 mg/kg ipr rat; Reference: FT63(1):3

Plant species with highest amount

Annona cherimola MILL. -- Cherimoya; 10,000 - 14,000 ppm in Seed;

Crataegus laevigata (POIR.) DC -- English Hawthorn, Hawthorn, Whitethorn, Woodland Hawthorn; 6,500 - 7,800 ppm in Flower; 5,100 - 6,200 ppm in Leaf;

Nigella sativa L. -- Black Caraway, Black Cumin, Fennel-Flower, Nutmeg-Flower, Roman Coriander; 3,218 ppm in Seed;

Oenothera biennis L. -- Evening-Primrose; 1,186 - 2,528 ppm in Seed;

Salvia officinalis L. -- Sage; 5 - 2,450 ppm in Leaf JAD;

Morus alba L. -- Sang-Pai-Pi, White Mulberry; 2,000 ppm in Leaf;

Senna obtusifolia (L.) H.IRWIN & BARNEBY -- Sicklepod; 1,000 - 2,000 ppm in Seed;

Fagopyrum esculentum MOENCH. -- Buckwheat; 1,880 ppm in Seed;

Ocimum basilicum L. -- Basil, Cuban Basil, Sweet Basil; 896 - 1,705 ppm in Leaf JAD;

Zea mays L. -- Corn; 1,300 ppm in Silk Stigma Style;

Salvia officinalis L. -- Sage; 1,214 ppm in Stem JAD;

Ocimum basilicum L. -- Basil, Cuban Basil, Sweet Basil; 1,051 ppm in Flower JAD;

Hippophae rhamnoides L. -- Sallow Thorn, Sea Buckthorn, Yellow Spine; 550 - 970 ppm in Seed ABS;

Glycine max (L.) MERR. -- Soybean; 900 ppm in Seed;

Glycyrrhiza glabra L. -- Commom Licorice, Licorice, Licorice-Root, Smooth Licorice; 500 ppm in Root JAD;

Ocimum basilicum L. -- Basil, Cuban Basil, Sweet Basil; 408 ppm in Root JAD;

Viola odorata L. -- Common Violet, Sweet Violet; 330 ppm in Plant;

Ocimum basilicum L. -- Basil, Cuban Basil, Sweet Basil; 230 ppm in Sprout Seedling JAD; 230 ppm in Stem JAD;

Withania somnifera (L.) DUNAL -- Ashwagandha; 200 ppm in Root;

Serenoa repens (W. BARTRAM) SMALL -- Saw Palmetto, Scrub-Palmetto; 189 ppm in Fruit;

Acacia senegal (L.) WILLD. -- Gum Arabic, Gum Arabic Tree, Kher, Senegal Gum, Sudan Gum Arabic; in Plant;

Achillea millefolium L. -- Milfoil, Yarrow; in Plant;

Achyranthes bidentata BLUME -- Chaff Flower; in Root;

Actinidia chinensis PLANCHON -- Kiwi; in Plant;

Ageratum conyzoides L. -- Mexican ageratum; in Plant WO2;

Ailanthus altissima (MILL.) SWINGLE -- Stinktree, Tree Of Heaven; in Plant;

Ajuga bracteosa WALL. -- Nilkanthi; in Plant WO2;

Aleurites fordii HEMSL. -- Tungoil Tree; in Plant;

Alisma plantago-aquatica L. -- Mud Plantain, Tse-Hsieh, Water Plantain, Ze-Xie; in Rhizome;

Allium ampeloprasum L. -- Elephant Garlic, Kurrat; in Plant;