The scientific name of the aloe vera is Aloe vera (L.) Burm.f. It is also known as Barbados aloe, Aloe, and Burn plant.
Other names include
|AFRIKAANS: Aalwee, Aalwyn.|
|BENGALI: Ghrita kumari, Kumari.|
|CHINESE: Lu hui.|
|FRENCH: Aloès, Aloès vulgaire.|
|GERMAN: Echte Aloe.|
|HINDI: Guar patha, Ghikanvar.|
|ITALIAN: Aloe di Curacao, Aloe delle Barbados, Aloe mediterranea, Aloe vera, Legno aloe.|
|MALAY: Pohon gaharu.|
|NEPALESE: Ghiu kumari.|
|POLISH: Aloes zwyczajny.|
|PORTUGUESE: Aloés, Aloé vera, Babosa (Brazil), Aloés de Barbados, Erva-babosa, Azebre Vegetal.|
|RUSSIAN: Aloe, Aloe nastojaščee ,Aloe vera.|
|SANSKRIT: Ghirita kumari, Kumari.|
|SPANISH: Acíbar, Aloe, Flor do deserto, Loto do deserto, Lináloe, Maguey morado, Penca sábila, Pitera amarelo, Sábila do penca, Sávila, Toots amarelo, Zábila, Zábila dos toots.|
|SWEDISH: Aloe, Barbados aloe.|
|TELUGU: Chinna kalabanda.|
|THAI: Hang ta khe, Wan fai mai, Wan hang chora khe.|
|TURKISH: Ödağacı., Sarısabır, Sarýsabýr.|
|VIETNAMESE: Cây aloe vera, Cây Lô Hội , Cây Nha Đam.|
Aloe vera has been used by many cultures since ancient times. Early records of use appear in the 16th century BC Eber Papyrus. It was a component of the cosmetic beautifying regimes of Egyptian queens Nefertii and Cleopatra. It has been used in ancient wars for treatment of wounds. It held folkloric status as a herbal cure-all until the mid-1930s, when it found application in the treatment of chronic and severe radiation dermatitis. Today it is a component of countless beauty, health, and skin care products.
Aloe is an herb plant growing 30 to 40 centimeters high. Leaves arising from the ground are smooth, thick, fleshy, mucilaginous, succulent, 20 to 50 centimeters long, 5 to 8 centimeters wide, light green with white blotches, narrow-lanceolate, tapering, spiny-toothed margins. Flowering stalk is erect, usually twice the height of the plant. Flowers are 2 to 3 centimeters long, yellow, with segments that about equals the oblong tube.
– Cultivated for ornamental and medicinal purposes.
– Introduced; a native of Africa.
– Occurs in subtemperate and tropical regions.
– Commonly raised in clay pots or perforated containers.
– Sporadic in the yard; ordinary garden soil with compost is best.
– Regenerates its growth as lower leaves are cut, perpetuating availability of the material.
Medicinal properties of aloe vera
• Aromatic, astringent, aperient, purgative, emmenagogue, emollient, cholagogue, laxative, stomachic, tonic, vulnerary.
• Considered antitoxic, anticancer, antimutagenic.
– Contains more than 75 active constituents: vitamins, enzymes, minerals, sugars, lignin, saponins, salicylic acids and amino acids.
– Aloin; barbaloin, 25%; isobarbaloin resin, 12.5%; (sicaloin; emodin; cinnamic acid; b-arabinose; oxidase); cinnamic acid; resin up to 20% (aloesin, aloesone, aloeresin A and C); coumarins, traces of volatile oil.
– Freeze-dried leaves of Aloe vera yielded aloe-emodin, feralolide, a mixture of aloins A and B, elgonica dimers A and B.
Leaves, pulp, and sap.
Dried juice from leaves.
Harvest mature leaves and rinse with water; remove spines prior to use.
– There is confusing and contradicting information on edibility and reports on gastrointestinal cathartic effects.
– Aloe vera can be eaten, raw or cooked. The pale green skin hides the clear meat inside the leaves and its natural gel, both of which are edible.
– Jelly from matured leaves can be cut in small cubes, boiled with rock sugar for a sweetened cooling drink.
Folkloric traditional medicine uses and remedies with aloe vera
– Use for dandruff.
– Dried latex from leaf taken by mouth as laxative.
– Juice of fleshy leaves is usually mixed with gogo by Filipino women and used to prevent falling of fair or as a cure for baldness.
– Juice from leaves mixed with wine used to preserve the hair
– In the Philippines, leaves used to poultice edema associated with beriberi.
– Juice from leaves mixed with milk used for dysentery and pains of the kidney.
– Fresh juice expressed from the leaves is spread on skin burns, scalds, scrapes, sunburn and wounds.
– Burns and scalds: Use ointment made by mixing equal amounts of powdered aloe and coconut oil.
– Used for wound healing.
– For conjunctivitis, leaf juice is applied to the outer eyelid.
– Used for sprains, sore throat.
– In small doses, used as a tonic; in larger doses, as aperient; and in still larger doses, drastically so; it is also used as emmenagogue and cholagogue.
– In small doses, considered stomachic tonic; in large doses, as purgative.
– In Costa Rica, the mucilaginous pulp of leaves is used as purgative.
– For contusions or local edema, bruised fresh leaves are applied as poultice over affected areas.
– For alopecia and falling hair, remove the spines, cut leaves and rub directly on the scalp. The juice of fresh leave may be mixed with gogo and used as a shampoo.
– Juice mixed with coconut milk used for dysentery and kidney pains.
– For bruises, equal parts of juice and alcohol are applied to affected areas.
– For hemorrhoids, cuticle from leaves used as suppository for hemorrhoids.
– In India and the Antilles the alcoholic tincture of inspissated juice is used for bruises, contusions and ecchymoses.
– In the Arabian peninsula, used for diabetes.
– For burns and scalds, an ointment is prepared by mixing 2 drams of powdered aloe with 2 drams.
– Also used for herpes simplex sores, tendinitis, dandruff, menstrual cramps, acne, stomatitis, varicose veins, warts, hemorrhoids.
– Used in combination with licorice roots to treat eczema and psoriasis.
Recent new uses
Plant materials derived from Aloe barbadensis (flower extract, leaf, leaf extract, leaf juice, leaf polysaccharides, leaf waters) are used as cosmetic ingredients for skin conditioning purposes, and included in cosmetics only at low concentrations. (see study)
- Benefits are derived from a combination of all active components; the aqueous form provides the most benefits.
- Leaf jelly used for various cosmetic and new-age concoctions for pimples, acne, stomatitis, hemorrhoidal itching, superficial burns. Aloe gel is a common household remedy for minor cuts, burns and sunburns.
- Salicylic acid content can inhibit prostaglandin and thromboxane formation by blocking the arachidonic acid cascade.
- UV-B protection through cinnamic acid.
Concerns / Toxicities / Pros & Cons:
– Aloe vera can be eaten, raw or cooked. The pale green skin hides the clear meat inside the leaves and its natural gel (greenish goo-like), both of which are edible.
– Aloe is likely safe when applied to the skin for burns, psoriasis, wound healing and to reduce pain and inflammation.
People with known allergy to other plants in the Liliaceae family (onions, garlic, tulips) may have allergic reactions to aloe. Delayed allergic reactions – hives and rash – may develop with prolonged use.
(2) Aloe leaf consists of pericyclic cells, found just below the plant’s skin and inner central area of the leaf, i.e., the gel, which is used in cosmetics. These cells produce a bitter, yellow latex containing anthraquinones, phototoxic compounds that are gastrointestinally irritating and responsible for its cathartic effects. (see study)
(3) Chronic ingestion of whole leaf extracts should be limited and extracts low in anthraquinones and phenolics should be considered to reduce adenomas and adenocarcinomas of the large colon. (see study)
(4) Aloin / Contact Dermatitis / Laxative:
The latex or juice (just below the outer skin) contains aloin, an anthraquinone glycoside, which has been reported to cause skin irritation or contact dermatitis in those with allergy to latex. The use of aloin latex as laxative may cause severe cramping and purging of the intestines; misuse can lead to electrolyte loss.
Use of aloe vera during pregnancy and breastfeeding:
While topical application is likely safe during pregnancy and lactation, internal use should be avoided. Theoretical stimulation of uterine contractions is a concern; likewise, the possibility that components of aloe may be excreted with breast milk.
Scientific proven health benefits and uses of aloe vera
(1) Aloin is the presumed laxative component of aloe. Further studies are needed to establish the dose and safety.
(2) Anthraquinones in the latex considered to have potent laxative property, increasing intestinal water content, and stimulates mucus secretion and peristalsis.
• Radioprotective / Gamma and UV Exposure:
Studies have reported a protective effect against radiation damage to the skin. It decreases the production and release of skin keratinocyte-derived immunosuppressive cytokines (IL-10), preventing UV-suppression of delayed type hypersensitivity.
Two randomized, double blind trials compared topical aloe vera cream (0.5% hydrophilic) or placebo three times daily for two weeks in 180 men with a first episode of genital herpes; one also assessed topical aloe vera gel. Response rates in the two trials were almost identical. The proportions of patients cured in the two trials were 70% and 67% with aloe vera cream, 45% with aloe vera gel, and 7.5% and 7.0% with placebo. Times to healing were 4.8 and 4.9 days with aloe vera cream, 7.0 days with aloe vera gel, and 14 and 12 days with placebo.
(1) Evidence suggests aloe extract in hydrophilic creams to be of benefit in psoriasis vulgaris.
(2) One randomized double-blind trial assessed a 0.5% hydrophilic aloe vera cream compared with placebo cream in 60 patients with mild to moderate chronic plaque-type psoriasis over four weeks. The rate of cure was significantly better with aloe vera (83% ) than with placebo (7%) with no relapses.
Studies suggest effectiveness for treatment of seborrheic dermatitis.
Study showed antigenotoxic potentials of aloe and suggests a potential use in prevention of DNA damage caused by chemical agents.
A double-blind placebo-controlled study to evaluate the efficacy and tolerability of topical Aloe vera in a hydrophilic creams showed it to be more effective than placebo without toxic or objective side effects and can be considered a safe alternative treatment for psoriasis.
Study isolated di(2-ethylhexyl)phthalate (DEHP) from Aloe vera. It exhibited growth inhibition against three leukemic cell lines and reduced AF-2-induced mutagenicity. DEHP was considered the active principle responsible for the anti-leukemic and anti-mutagenic effects in vitro.
Study isolated a major carbohydrate fraction from the gel of Aloe vera leaf. It has been claimed to accelerate wound healing, immune stimulation and have anti-cancer and anti-viral effects. Study showed acemannan stimulate cytokine production, nitric oxide release. The production of cytokines IL-6 and TNF-alpha were acemannan dose-dependent. The results suggest acemannan may function, in part, through macrophage activation.
Study characterized a new immunostimulatory polysaccharide, Aloeride, from commercial aloe vera juice.
Study showed aloe-emodin inhibited cell proliferation and induced apoptosis in two human liver cancer cell lines, but with different antiproliferative mechanisms. Results suggest aloe-emodin may be useful in liver cancer prevention.
Study showed percentage of both objective tumor regressions and disease control was significantly higher in patients concomitantly treated with Aloe than with chemotherapy alone. Study suggest Aloe may be beneficial to use with chemotherapy to increase efficacy in terms of both tumor regression and survival time.
In a study of patients with non-insulin diabetes and Swiss albino mice with alloxan-induced diabetes, lowering of blood sugars was noted by as yet unknown mechanisms.
• Increased Glucose Tolerance:
In a study of 5 plants used by Kuwaiti diabetics, only extracts with myrrh and Aloe gums effectively increase glucose tolerance in both normal and diabetic rats.
Based on meta-analysis using duration of wound healing as the outcome measure, the healing time of the aloe vera group was 8.79 days shorted than the control group. Cumulative evidence supports aloe vera as beneficial intervention for burn wound healing in first to second degree burns. (Some studies have shown contrary results, with one showing delayed healing. Also, the use of aloe on surgical wounds has been reported to slow healing.
Study evaluated the antibacterial activity of leaf and gel extracts against gram positive and gram negative skin infections isolates. The gel extracts showed antibacterial activity against both gram positive and gram negative isolates. Leaf extracts showed no activity.
Aloe vera is incorporated in many skin care/cosmetic products. Studies have suggested it may enhance the induction of skin cancer by ultraviolet radiation. This study found a weak enhancing effect of aloe vera leaf or decolorized whole leaf on the photocarcinogenic activity of SSL (simulated solar light) in both male and female mice.
In a study of 16 patients treated with Aloe vera and 14 patients with benzyl benzoate lotion, the Aloe vera gel showed to be as effective as benzyl benzoate in the treatment of scabies.
Study showed oral supplementation with Aloe vera reduced postprandial bloating, reduced flatulence, and improved colonic bacterial function.
Aloe vera yields six antiseptic constituents — lupeol, salicylic acid, urea nitrogen, cinnamonic acid, phenols, and sulfur — with inhibitory effect on fungi, bacteria and viruses.
Study showed the possibility of presence of bioactive components in crude extracts. Tested against E. coli, B. subtilis, S. typhi, Pseudomonas, K. pneumonia, S. epidermis, a methanol extract showed maximum antibacterial activity as compared to other solvent extracts.
Review concludes that event though there are promising results, clinical effectivenes of oral or topical aloe vera is not sufficiently defined at present.
Study showed Aloe vera juice supplementation in normal individuals was well tolerated, without covert or overt adverse effects on GI physiology. There was improved bowel motility, increased stool specific gravity, and reduced protein putrefaction in the colon. There was reduced postprandial bloating and reduced flatulence.
Review suggests a preponderance of evidence that suggests a trend toward benefit from oral aloe vera in reducing FBS and HbA1c. There was triglyceride reduction, but evidence for LDL, HDL, and total cholesterol are conflicting. Weaknesses in study methods and inconsistency in data do not currently warrant recommendation of oral aloe vera for the management of diabetes mellitus or dyslipidemia.
Study on the antifungal activity of different extracts of Aloe vera plant showed the acetone extract as an effective antifungal to inhibit growth of Aspergillus flavus.
A randomized DB PC trial showed no overall benefit compared to patients on placebo. The study concludes AV is safe to take and could possible benefit patients with predominant diarrhea or the alternating diarrhea and constipation of IBS.
Aloe barbadensis derived ingredients were not toxic in acute oral studies using mice and rats. In parenteral studies, the LD50 in mice was >200 mg/kg, rats >50 mg/kg, and dogs >50 mg/kg. In intravenous studies the LD5- was mice>80 mg/kg rats > 15 mg/kg, and dogs >10 mg/kg. In a 3-month study in mice, an alcohol extract given orally in drinking water at 100 mg/kg produced reproductive toxicity, inflammation and mortality above that seen in controls. A methanol extract given to mice at 100 mg/kg for 3 months caused significant sperm damage compared to controls.
The Cosmetic Ingredient Review Expert Panel concluded that the anthraquinone levels in several Aloe barbadensis extracts are well understood and can conform to the industry established level of 50 ppm. Although phototoxicity from anthraquinone components have been demonstrated, clinical studies have showed no phototoxicity, confirming the anthraquinone concentrations in such preparations are too low to induce toxicity.
A two-year study of a non-decolorized whole leaf extract of A. vera in drinking water found clear evidence of carcinogenic activity in male and female rats, based on tumors of the large intestine. There was no evidence of carcinogenic activity in male and female mice. Questions raised were: What products are in the market place? Aloin levels? Patterns of exposure?
A review on the effect of aloe vera on cutaneous wound healing concludes that aloe vera improves the wound healing in both clinical and experimental conditions. The use of aloe vera gel ethanolic extract attenuated the diabetic foot wound in rats. A clinical trial reported A. vera and Calendula ointment improved the speed of episiotomy wound healing. Review suggests considering Aloe vera treatment for improvement of wound healing is useful as well as other standard treatments.
While animal studies suggest components of aloe vera have hepatoprotective properties, at least a dozen cases of hepatotoxicity have been reported. Injury usually arises 3 to 24 weeks after starting oral aloe vera, usually taken in high doses for constipation, dyspepsia, aging and wellness. The pattern of injury is usually hepatocellular. None of aloe vera’s leaf components are particularly hepatotoxic. Hepatotoxicity is rare and usually self-limiting. Severe cases are rare, and there have been no cases leading to fatalities, liver transplantation or chronic hepatitis. Recurrent toxic hepatitis is likely from reexposure.
Study evaluated the inhibitory potency of ethanol extracts of two commercially available aloe vera juice. One of the AVJ extracts showed twice the inhibitory potency towards both CYP enzymes (CYP3A4 and CYP2D6) with dual mechanistic inhibition (both CYP mediated and non-CYP mediated) which can affect the intracellular concentration of drugs metabolized by the enzymes.
Concomitant use with aloe vera may have additive antiplatelet effects to cause excessive bleeding during surgery. Sevoflurane inhibits thromboxane A(2) formation by suppression of cyclooxygenase activity, impairs platelet aggregation and prolongs bleeding.
– Ingredients to many commercial hair/cosmetic products.
– Gels, capsules, extracts in the market
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