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Nettle- Medicinal Uses, Interactions, Side Effects, Dosage

Uses and Benefits:

Nettle is predominately employed in Western cultures for the treatment of arthritis pain, allergies, and benign prostatic hypertrophy (BPH). In European herbal traditions, it is also considered to have diuretic properties. Historical and folk uses of nettle include treatment for diarrhea, constipation, asthma, pleurisy, and eczema; it has also been used as an astringent or hemostatic for nose bleeds, uterine hemorrhage, and the like. The leaves are used for their analgesic, anti-inflammatory, and diuretic properties, while the root is used for its anti proliferative effect on prostatie cells.

Pharmacology:

The major constituents of the leaves include organic acids (e.g., carbonic, formic, citric), amines, and flavonoid compounds. The stinging source of nettle is in the leaf and stemandular hairs, which contain acetylcholine, serotonin, formic acid, and histamine. The roots containsitosterol and other sterols, lectins, polysaccharides, hydroxycoumarins and lignans. In addition, the plant is rich in amino acids, vitamins, and other nutrients.

Nettle extracts can partially inhibit prostaglandin and leukotriene synthesis in vitro,and have been found to inhibit specific inflam?matory mediators such as IL-2, IFN-gamma, and NF-kappa B,l,8

A decreased release of lipopolysaccharide-stimulated TNF-alph, and IL-1 was demonstrated in blood from human volunteers takinu a nettle leaf extract, but other in vitro effects were not validated:

Hormonally responsive prostate tissue is altered in subject Husing nettle root extracts, and this has been attributed to severnl compounds present in the roop, A steroidal-like hydrophobio compound inhibits Na+/K+-ATPase, which can suppress prostatic cell growth, Lignans inhibit the binding of sex hormone-binding globulin (SHBG) to androgens and nettle decreases SHBG serum levels in controlled studies. Specific compounds may also inhibit 5-alpha-reductase or aromatase activity in the prostate, blocking the formation of dihydrotestosterone or estradiol, respec?tively. Further, polysaccharide fractions of methanolic extracts have anti-proliferative effects on prostate epithelia.

A diuretic effect was observed in rats after intravenous or in?traperitoneal injections of a nettle extract, but no effect was observed after oral administration. Parenteral administration of nettle extracts can also cause depression of the central nervous system (CNS), hypotension, and bradycardia in animals.

Clinical Trials:

Many of these studies have been performed in Germany.

Arthritis-The anti-inflammatory/analgesic property of nettle leaf has been used for arthritis symptoms. Topical application appeared to be beneficial in a randomized controlled trial (RCT) for base-of-thumb osteoarthritis; however, the double-blinding (which is difficult to provide for a stinging preparation) was incom?pleteY Oral preparations were reported to be beneficial in four German studies, primarily in terms of NSAID dose reduction. However, the quality of these studies is questionable because only two were controlled, one randomized, and none blinded.

Allergies-For the treatment of allergic rhinitis, a double-blind RCT in the U.S. evaluated the effect of an orally administered freeze-dried preparation for 1 week. Global assessments of subjective effectiveness were favorable after therapy was completed, but personal diary data revealed only a slightly better outcome than placebo. The large drop-out rate (mainly in the nettle group), unclear dosing, and lack of statistical analysis weaken the results of this study.

Adverse Effects:

Nettle is well tolerated; side effects are generally similar to placebo in the controlled studies. Mild gastrointestinal irritation has been reported, but is uncommon.

Side Effects and Interactions:

Because nettle extract has CNS-depressant effects in rodent toxicity studies, some authorities warn against conmmitant use with CNS depressants. However, it is doubtful that these results apply to humans; there are no reported adverse CNS effects or drug interactions with nettle in the herbal or medical literature.

Cautions:

Uteroactivity has been reported in pregnant and non-pregnant mice, so caution is warranted in pregnant and breast-feeding women. Herbalists have generally found no adverse effects in these populations, however.

Preparations & Doses: Multiple preparations and formulations of nettle are available, and controlled studies have examined different oral dosing regimens. For the anti-inflammatory effect in acute arthritis, 1340 mg/day of a powdered extract or 50 g/day of stewed nettle leaf was used. For allergic rhinitis, two 300-mg capsules of freeze-dried stinging nettle were dosed 1-7 times per day (mean t.i.d.). For BPH, typical doses are 300-600 mg b.i.lt of a methanol extract of the root. In the herbalist literature, 2-5 g t.i.d. of dried herb is usually taken as an infusion or extract. Topical application of the fresh leaf can be an effective analgesic, as long as the nettle produces a stinging sensation with wheals (it may act as a simple counterirritant), and treatment is repeated daily for several days. Summary Evaluation Several clinical trials have found nettle to be beneficial for arthritis pain and BPH symptoms, but poorly designed or unknown study methodology limits the potential benefits reported in these investigations. Minimal clinical evidence is available for the use of nettlo in allergic rhinitis and as a diuretic. As the use of nettle appears to be safe and well tolerated, it is acceptable for patients to try this herb for mild arthritic, allergic, or BPH symptoms. However, the efficacy for any indication remains unproven.

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Author: Steve Mathew
About the Author: Steve Mathew is a writer, who writes many great articles on herbal medicines for common ailments and diseases. For more information on herbal remedies and home remedies visit our site on health care.
Article Source: ArticlesBase.com - Nettle- Medicinal Uses, Interactions, Side Effects, Dosage

Nettle Tea Benefits Trivia:

Did you know that:

• Nettle tea is a rich source of potassium. This mineral plays an important role in conducting electricity in the body. Since the major organs of the body like the brain and heart cannot function without electricity, the role of electrolytes like potassium cannot be ignored. Read here to know more about Potassium.

• Nettle tea is also a rich source of calcium. This mineral is vital to the maintenance and development of bones in the body. Inadequate intake of calcium may contribute to accelerated bone loss and the development of osteoporosis. Get more information on Calcium here.

• Nettle tea has high levels of beta-carotene. A precursor of Vitamin A, beta-carotene contributes to the maintenance of good vision and protection from such eye diseases such as night blindness and cataract. Read more on Beta-carotene here.

• Nettle tea is said to be helpful in the treatment of asthma. The plant's seeming ability to fight allergic infections is what makes it a good ally against asthma. Go here for more info on other teas for asthma.

• Nettle leaves are said to contain about 16 types of amino acids. Amino acids are the building blocks of protein and the abundance of these amino acids in the plant contribute to nettle's high protein content. Studies have shown that nettle's protein content may be as high as 25% (dry weight) which is quite high for a leafy green vegetable.

• The quality of the water used to make nettle tea is very important. It is believed that the water used must be free of contaminants and contain enough oxygen to enhance the natural flavor of the drink. Nettle tea made with pure water yield a nice vegetal flavor and a drink that is aesthetically pleasant. Learn more about the health benefits of water here.

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