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Aloe vera

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Aloe vera (/ˈæloʊ(i) vɛrə, vɪər-/)[3] is a succulent plant species of the genus Aloe.[4] It is widely distributed, and is considered an invasive species in many world regions.[4][5]

Aloe vera
Plant with flower detail inset
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Asphodelaceae
Subfamily: Asphodeloideae
Genus: Aloe
Species:
A. vera
Binomial name
Aloe vera
Synonyms[1][2]
  • Aloe barbadensis Mill.
  • Aloe barbadensis var. chinensis Haw.
  • Aloe chinensis (Haw.) Baker
  • Aloe elongata Murray
  • Aloe flava Pers.
  • Aloe indica Royle
  • Aloe lanzae Tod.
  • Aloe maculata Forssk. (illegitimate)
  • Aloe perfoliata var. vera L.
  • Aloe rubescens DC.
  • Aloe variegata Forssk. (illegitimate)
  • Aloe vera Mill. (illegitimate)
  • Aloe vera var. chinensis (Haw.) A. Berger
  • Aloe vera var. lanzae Baker
  • Aloe vera var. littoralis J.Koenig ex Baker
  • Aloe vulgaris Lam.

An evergreen perennial, it originates from the Arabian Peninsula, but also grows wild in tropical, semi-tropical, and arid climates around the world.[4] It is cultivated for commercial products, mainly as a topical treatment used over centuries.[4][5] The species is considered attractive for decorative purposes, and is often used indoors as a potted plant.[6]

The leaves of Aloe vera contain significant amounts of the polysaccharide gel acemannan, which can be used for topical purposes.[7] Aloe skin contains aloin which is toxic. Products made from Aloe vera usually only use the gel.

There are many products containing aloe vera's acemannan, including skin lotions, cosmetics, ointments and gels for minor burns, skin abrasions, insect bites, and windburn.[8]

Oral ingestion of aloe vera extracts can be dangerous, because it causes reactions which are not yet fully understood.[5][9] It is especially dangerous for pregnant women. Some people have allergic reactions, even when the aloe vera is applied only to the skin.[5][9]

Etymology

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Teeth on the leaf edges

The genus name Aloe is derived from the Arabic word alloeh, meaning "bitter and shiny substance" or from Hebrew אוהלים ahalim, plural of אוהל ahal.[10][11][12] The specific epithet vera comes from verus meaning "true" in Latin.[11][13]

Common names

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Common names use aloe with a region of its distribution, such as Chinese aloe, Cape aloe or Barbados aloe.[5][14][15]

Taxonomy

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The species has several synonyms: Aloe barbadensis Mill., Aloe indica Royle, Aloe perfoliata L. var. vera and Aloe vulgaris Lam.[2][16][17] Some literature identifies the white-spotted form of Aloe vera as Aloe vera var. chinensis;[18][19] and the spotted form of Aloe vera may be conspecific with A. massawana.[20] The species was first described by Carl Linnaeus in 1753 as Aloe perfoliata var. vera,[21] and was described again in 1768 by Nicolaas Laurens Burman as Aloe vera in Flora Indica on 6 April and by Philip Miller as Aloe barbadensis some ten days after Burman in the Gardener's Dictionary.[22]

Techniques based on DNA comparison suggest Aloe vera is relatively closely related to Aloe perryi, a species endemic to Yemen.[23] Similar techniques, using chloroplast DNA sequence comparison and inter simple sequence repeat profiling have also suggested it is closely related to Aloe forbesii, Aloe inermis, Aloe scobinifolia, Aloe sinkatana, and Aloe striata.[24] With the exception of the South African species A. striata, these Aloe species are native to Socotra (Yemen), Somalia, and Sudan.[24] The lack of obvious natural populations of the species has led some authors to suggest Aloe vera may be of hybrid origin.[25]

Description

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Spotted forms, also named Aloe vera var. chinensis
 
Historical image from Acta Eruditorum, 1688

Aloe vera is a stemless or very short-stemmed plant growing to 60–100 centimetres (24–39 inches) tall, spreading by offsets.[4]

Leaves

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The leaves are thick and fleshy, green to grey-green, with some varieties showing white flecks on their upper and lower stem surfaces.[26] The margin of the leaf is serrated and has small white teeth.

Aloe vera leaves contain phytochemicals under study for possible bioactivity, such as lignans, phytosterols, polyphenols, acetylated mannans, polymannans, anthraquinones C-glycosides, anthrones, and other anthraquinones, such as emodin and various lectins.[11][27][28]

Flowers

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The flowers are produced in summer on a spike up to 90 cm (35 in) tall, each flower being pendulous, with a yellow tubular corolla 2–3 cm (3⁄4–1+1⁄4 in) long.[26][29]

Roots

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Like other Aloe species, Aloe vera forms arbuscular mycorrhiza, a root symbiosis that allows the plant better access to mineral nutrients from the soil.[30]

Distribution

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Aloe vera is considered to be native only to the south-east[31] Arabian Peninsula in the Hajar Mountains in north-eastern Oman and eastern U.A.E.[32] However, it has been widely cultivated around the world, and has become naturalized in North Africa, as well as Sudan and neighboring countries, along with the Canary Islands, Cape Verde, and Madeira Islands.[16] It has also naturalized in the Algarve region of Portugal,[33][34] and in wild areas across Spain, especially in the region of Murcia.[35]

The species was introduced to China and various parts of southern Europe in the 17th century.[36] It is widely naturalized elsewhere, occurring in arid, temperate, and tropical regions of temperate continents.[4][32][37] The current distribution may be the result of cultivation.[20][38]

Cultivation

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As an ornamental plant
 
Aloe vera plant with mite infection

Aloe vera has been widely grown as an ornamental plant. The species is popular with modern gardeners as a topical medicinal plant[39] and for its interesting flowers, form, and succulence. This succulence enables the species to survive in areas of low natural rainfall, making it ideal for rockeries and other low water-use gardens.[26] The species is hardy in zones 8–11, and is intolerant of heavy frost and snow.[29][40] The species is relatively resistant to most insect pests, though spider mites, mealy bugs, scale insects, and aphid species may cause a decline in plant health.[41][42] This plant has gained the Royal Horticultural Society's Award of Garden Merit.[43]

In pots, the species requires well-drained, sandy potting soil, and bright, sunny conditions. Aloe plants can turn red from sunburn under too much direct sun, though gradual acclimation may help.[44] The use of a good-quality commercial propagation mix or packaged "cacti and succulent mix" is recommended, as they allow good drainage.[45] Terra cotta pots are preferable as they are porous.[45] Potted plants should be allowed to completely dry before rewatering. When potted, aloes can become crowded with "pups" growing from the sides of the "mother plant". Plants that have become crowded can be divided and repotted to allow room for further growth, or the pups can be left with the mother plant.[44] During winter, Aloe vera may become dormant, during which little moisture is required.[44] In areas that receive frost or snow, the species is best kept indoors or in heated glasshouses.[29] Houseplants requiring similar care include haworthia and agave.[44]

There is large-scale agricultural production of Aloe vera in Australia,[46] Cuba, the Dominican Republic, China, Mexico,[47] India,[48] Jamaica,[49] Kenya, Tanzania, South Africa,[50] Spain,[51] and the United States,[52] with much of the output going toward the cosmetics industry.[4]

Uses

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Two substances from Aloe vera – a clear gel and its yellow latex – are used to manufacture commercial products.[9][39] Aloe gel typically is used to make topical medications for skin conditions, such as burns, wounds, frostbite, rashes, psoriasis, cold sores, and dry skin.[9][39] Aloe latex is used individually or manufactured as a product with other ingredients to be ingested for relief of constipation.[9][39] Aloe latex may be obtained in a dried form called resin or as "aloe dried juice".[53]

There is conflicting evidence regarding whether Aloe vera is effective as a treatment for wounds or burns.[5][39] There is some evidence that topical use of aloe products might relieve symptoms of certain skin disorders, such as psoriasis, acne, or rashes,[9][39] but topical application may cause an allergic reaction in some people.[11]

Aloe vera gel is used commercially as an ingredient in yogurts, beverages, and some desserts,[54] but at high or prolonged doses, ingesting aloe latex or whole leaf extract can be toxic.[5][9][11][15] Use of topical aloe vera in small amounts is likely to be safe.[9][39]

Topical medication and potential side effects

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Aloe vera may be prepared as a lotion, gel, soap or cosmetics product for use on skin as a topical medication.[5] For people with allergies to Aloe vera, skin reactions may include contact dermatitis with mild redness and itching, difficulty with breathing, or swelling of the face, lips, tongue, or throat.[5][11][15]

Dietary supplement

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Aloin, a compound found in the semi-liquid latex of some Aloe species, was a common ingredient in over-the-counter (OTC) laxative products in the United States until 2002 when the Food and Drug Administration banned it because manufacturers failed to provide the necessary safety data.[5][9][55] Aloe vera has potential toxicity, with side effects occurring at some dose levels both when ingested and when applied topically.[5][15] Although toxicity may be less when aloin is removed by processing, Aloe vera ingested in high amounts may induce side effects, such as abdominal pain, diarrhea or hepatitis.[5][56] Chronic ingestion of aloe (dose of 1 gram per day) may cause adverse effects, including hematuria, weight loss, and cardiac or kidney disorders.[5]

Aloe vera juice is marketed to support the health of the digestive system, but there is neither scientific evidence nor regulatory approval for this claim.[5][9][39] The extracts and quantities typically used for such purposes are associated with toxicity in a dose-dependent way.[5][11][15]

Traditional medicine

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Aloe vera is used in traditional medicine as a skin treatment. Early records of its use appear from the fourth millennium BCE.[5] It is also written of in the Juliana Anicia Codex of 512 CE.[54]: 9 

Commodities

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Aloe vera is used on facial tissues where it is promoted as a moisturizer and anti-irritant to reduce chafing of the nose. Cosmetic companies commonly add sap or other derivatives from Aloe vera to products such as makeup, tissues, moisturizers, soaps, sunscreens, incense, shaving cream, or shampoos.[54] A review of academic literature notes that its inclusion in many hygiene products is due to its "moisturizing emollient effect".[28]

Toxicity

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Orally ingested non-decolorized aloe vera leaf extract was listed by the California Office of Environmental Health Hazard Assessment among "chemicals known to the state to cause cancer or reproductive toxicity",[57] possibly resulting from the anthraquinones.[11]

Since 2016, aloe vera whole leaf extract is classified as a possible human carcinogen (group 2B) by the International Agency for Research on Cancer.[58]

Use of aloe vera on the skin is generally not associated with significant side effects.[9] Oral ingestion of aloe vera is potentially toxic,[5][11] and may cause abdominal cramps and diarrhea which in turn can decrease the absorption of drugs.[5][9]

Interactions with prescribed drugs

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Ingested aloe products may have adverse interactions with prescription drugs, such as those used to treat blood clots, diabetes, heart disease and potassium-lowering agents (such as Digoxin), and diuretics, among others.[5][39]

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  •  
    Leaf and inner gel
  •  
    Gel used for desserts
  •  
    Es lidah buaya, an Indonesian Aloe vera iced drink
  •  
    Juice
  •  
    Cut leaf
  •  
    Diagram of leaf: 1 Cuticle, 2 Chloroplast parenchym, 3 Inner tissue,  4 Vascular bundles
  •  
    Buds
  •  
    Flower buds
  •  
    Flowers
  •  
    Plants of different sizes
  •  
    A potted plant
  •  
    Sucker

References

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  1. ^ Aloe vera (L.) Burm. f. Tropicos.org
  2. ^ a b "Aloe vera L. Burm.f. Fl. Indica : 83 (1768)". World Flora Online. World flora Consortium. 2022. Retrieved 16 December 2022.
  3. ^ "aloe vera". Dictionary.com Unabridged (Online). n.d.
  4. ^ a b c d e f g "Aloe vera (true aloe)". Centre for Agriculture and Bioscience International. 13 February 2019. Retrieved 15 October 2019.
  5. ^ a b c d e f g h i j k l m n o p q r s "Aloe". Drugs.com. 30 December 2020. Retrieved 1 July 2021.
  6. ^ Perkins, Cyndi (13 March 2013). "Is Aloe a tropical plant?". SFGate. Retrieved 13 February 2016.
  7. ^ Liu, Chang; Cui, Yan; Pi, Fuwei; Cheng, Yuliang; Guo, Yahui; Qian, He (19 April 2019). "Extraction, Purification, Structural Characteristics, Biological Activities and Pharmacological Applications of Acemannan, a Polysaccharide from Aloe vera: A Review". Molecules. 24 (8): 1554. doi:10.3390/molecules24081554. ISSN 1420-3049. PMC 6515206. PMID 31010204.
  8. ^ Surjushe, Amar; Vasani, Resham; Saple, D G (2008). "Aloe vera: A short review". Indian Journal of Dermatology. 53 (4): 163–166. doi:10.4103/0019-5154.44785. ISSN 0019-5154. PMC 2763764. PMID 19882025.
  9. ^ a b c d e f g h i j k l "Aloe vera". National Center for Complementary and Integrative Health, US National Institutes of Health. 1 October 2020. Retrieved 1 July 2021.
  10. ^ Harper, Douglas (2021). "Aloe". Online Etymology Dictionary. Retrieved 1 July 2021.
  11. ^ a b c d e f g h i Guo, Xiaoqing; Mei, Nan (2 April 2016). "Aloe vera: A review of toxicity and adverse clinical effects". J Environ Sci Health C Environ Carcinog Ecotoxicol Rev. 34 (2): 77–96. Bibcode:2016JESHC..34...77G. doi:10.1080/10590501.2016.1166826. PMC 6349368. PMID 26986231.
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  15. ^ a b c d e Cosmetic Ingredient Review Expert Panel (2007). "Final Report on the Safety Assessment of Aloe Andongensis Extract, Aloe Andongensis Leaf Juice, Aloe Arborescens Leaf Extract, Aloe Arborescens Leaf Juice, Aloe Arborescens Leaf Protoplasts, Aloe Barbadensis Flower Extract, Aloe Barbadensis Leaf, Aloe Barbadensis Leaf Extract, Aloe Barbadensis Leaf Juice, Aloe Barbadensis Leaf Polysaccharides, Aloe Barbadensis Leaf Water, Aloe Ferox Leaf Extract, Aloe Ferox Leaf Juice, and Aloe Ferox Leaf Juice Extract" (PDF). Int. J. Toxicol. 26 (Suppl 2): 1–50. doi:10.1080/10915810701351186. PMID 17613130. S2CID 86018076. Archived from the original (PDF) on 15 December 2017. Retrieved 24 May 2016.
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  21. ^ Linnaeus, C. (1753). Species plantarum, exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas. Vol. 2 pp. [i], 561–1200, [1–30, index], [i, err.]. Holmiae [Stockholm]: Impensis Laurentii Salvii.
  22. ^ Newton LE (1979). "In defense of the name Aloe vera". The Cactus and Succulent Journal of Great Britain. 41: 29–30.
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  24. ^ a b Treutlein J, Smith GF, van Wyk BE, Wink W (2003). "Phylogenetic relationships in Asphodelaceae (Alooideae) inferred from chloroplast DNA sequences (rbcl, matK) and from genomic finger-printing (ISSR)". Taxon. 52 (2): 193–207. doi:10.2307/3647389. JSTOR 3647389.
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  30. ^ Gong M.; Wang F.; Chen Y (2002). "[Study on application of arbuscular-mycorrhizas in growing seedings of Aloe vera]". Zhong Yao Cai (in Chinese). 25 (1): 1–3. PMID 12583231.
  31. ^ "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". wcsp.science.kew.org. Archived from the original on 1 November 2022. Retrieved 7 December 2020.
  32. ^ a b "Aloe vera". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Archived from the original on 1 November 2022. Retrieved 19 November 2017.
  33. ^ Domingues de Almeida, J & Freitas (2006). "Exotic naturalized flora of continental Portugal – A reassessment" (PDF). core.ac.uk. Retrieved 16 July 2020.
  34. ^ Gideon F Smith, Estrela Figueiredo (2009). "Aloe arborescens Mill. and Aloe Vera spreading in Portugal". Bradleya. bioone. doi:10.25223/brad.n27.2009.a4. hdl:2263/14380. S2CID 82872880.
  35. ^ "Aloe Vera Cultivation in Murcia". 9 April 2015.
  36. ^ Farooqi, A. A. and Sreeramu, B. S. (2001) Cultivation of Medicinal and Aromatic Crops. Orient Longman, India. ISBN 8173712514. p. 25.
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  38. ^ "Aloe vera (Linnaeus) Burman f., Fl. Indica. 83. 1768." in Flora of North America Vol. 26, p. 411
  39. ^ a b c d e f g h i "Aloe (Aloe vera)". Mayo Clinic. 17 September 2017. Retrieved 21 January 2020.
  40. ^ "BBC Gardening, Aloe vera". British Broadcasting Corporation. Retrieved 11 July 2008.
  41. ^ "Pest Alert: Aloe vera aphid Aloephagus myersi Essi". Florida Department of Agriculture and Consumer Services. Archived from the original on 12 June 2008. Retrieved 11 July 2008.
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  43. ^ "RHS Plant Selector Aloe vera AGM / RHS Gardening". Apps.rhs.org.uk. Retrieved 9 April 2020.
  44. ^ a b c d Peerless, Veronica (2017). How Not to Kill Your Houseplant. DK Penguin Random House. pp. 38–39.
  45. ^ a b Coleby-Williams, J (21 June 2008). "Fact Sheet: Aloes". Gardening Australia, Australian Broadcasting Corporation. Archived from the original on 6 July 2008. Retrieved 8 July 2008.
  46. ^ "Aloe vera producer signs $3m China deal". ABC News. Australian Broadcasting Corporation. 6 December 2005.
  47. ^ "Korea interested in Dominican 'aloe vera'". DominicanToday.com—The Dominican Republic News Source in English. 7 July 2006. Archived from the original on 6 December 2008.
  48. ^ Varma, Vaibhav (11 December 2005). "India experiments with farming medicinal plants". channelnewsasia.com.
  49. ^ "Harnessing the potential of our aloe". Jamaica Gleaner, jamaica-gleaner.com. Archived from the original on 24 March 2008. Retrieved 19 July 2008.
  50. ^ Mburu, Solomon (2 August 2007). "Kenya: Imported Gel Hurts Aloe Vera Market". allafrica.com.
  51. ^ "Córdoba is the Spanish province with more aloe vera crops (translated from Spanish)". ABC-Córdoba. 23 August 2015.
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  53. ^ "Assessment report on Aloe barbadensis Mill. and on Aloe (various species, mainly Aloe ferox Mill. and its hybrids), folii succus siccatus" (PDF). European Medicines Agency. 22 November 2016. Retrieved 29 January 2021.
  54. ^ a b c Reynolds, Tom (Ed.) (2004) Aloes: The genus Aloe (Medicinal and Aromatic Plants - Industrial Profiles. CRC Press. ISBN 978-0415306720
  55. ^ Food Drug Administration, HHS (2002). "Status of certain additional over-the-counter drug category II and III active ingredients. Final rule". Fed Regist. 67 (90): 31125–7. PMID 12001972.
  56. ^ Bottenberg MM, Wall GC, Harvey RL, Habib S (2007). "Oral aloe vera-induced hepatitis". Ann Pharmacother. 41 (10): 1740–3. doi:10.1345/aph.1K132. PMID 17726067. S2CID 25553593.
  57. ^ "Chemicals Listed Effective December 4, 2015, as Known to the State of California to Cause Cancer: Aloe Vera, Non-Decolorized Whole Leaf Extract, and Goldenseal Root Powder". California Office of Environmental Health Hazard Assessment. 4 December 2015. Retrieved 21 February 2020.
  58. ^ "IARC Monographs on the Identification of Carcinogenic Hazards to Humans". World Health Organization. Retrieved 27 April 2023.
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