, Volume 9, Issue 2, pp 7–17 | Cite as

Herbal teas

The benefit:risk ratio
  • Sarah Sarwar
  • Brian Lockwood


There is a long history of use of herbal teas. Recently, evidence has been produced outlining a number of possible medicinal effects of these teas including antioxidant activity, antimutagenic activity, immune response activity, anti-allergic activity, anti-diabetic properties, in addition to their beneficial mineral content. A wide range of adverse effects have been reported, in addition to the possible presence of pesticides, toxic trace elements, and pathogens. Interactions with conventional medicines are an increasing risk.

Key words

Herbal teas Health effects Mineral content Adverse effects Herb-drug interactions 


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  1. 1.
    Speisky H, Rocco C, Carrasco C, Lissi EA, Lopez-Alarcon C (2006) Antioxidant screening of medicinal herbal teas in Chile Phytother Res 20 462–467Google Scholar
  2. 2.
    McKay DL, Blumberg JB (2007) A review of the bioactivity of South African herbal teas: rooibos (Aspalathus linearis) and honeybush (Cyclopia intermedia) Phytother Res 21(1) 1–16Google Scholar
  3. 3.
    Erickson L (2003) Rooibos Tea: Research into antioxidant and antimutagenic properties HerbalGram 59 34–45Google Scholar
  4. 4.
    Apak R, Güçlü K, Ozyürek M, Esin Karademir S, Erçağ E (2006) The cupric ion reducing antioxidant capacity and polyphenolic content of some herbal teas Int J Food Sci Nutr 57(5–6) 292–304Google Scholar
  5. 5.
    Okamura S, Tamura H (2004) Effect of herbal teas on conjugation reactions in a human colon carcinoma cell line, Caco-2 J Health Sci 50(2) 189–192Google Scholar
  6. 6.
    Trucksess MW, Scott PM (2008) Mycotoxins in botanicals and dried fruits: A review Food Add Contam 25(2) 181–192Google Scholar
  7. 7.
    Naithani V, Nair S, Kakkar P (2006) Decline in antioxidant capacity of Indian herbal teas during storage and its relation to phenolic content Food Res Int 39 176–181Google Scholar
  8. 8.
    Manteiga R, Park DL, Ali SS (1997) Risks associated with consumption of herbal teas Rev Environ Contam Toxicol 150 1–30Google Scholar
  9. 9.
    Kamara BI, Brandt EV, Ferreira D, Joubert E (2003) Polyphenols from Honeybush Tea (Cyclopia intermedia) J Agric Food Chem 51(13) 3874–3879Google Scholar
  10. 10.
    Chen H, Lin Y, Hsieh C (2007) Evaluation of antioxidant activity of aqueous extract of some selected nutraceutical herbs Food Chem 1041 1418–1424Google Scholar
  11. 11.
    Martin EA (1998) Concise colour medical dictionary 2nd edition, Oxford University Press, Oxford, p 199, 217Google Scholar
  12. 12.
    Nookabkaew S, Rangkadilok N, Satayavivad J (2006) Determination of trace elements in herbal tea products and their infusions consumed in Thailand J Agric Food Chem 54 6939–6944Google Scholar
  13. 13.
    Manach C, Scalbert A, Morand C, Rémésy C, Jiménez L (2004) Polyphenols: food sources and bioavailability Am J Clin Nutr 79(5) 727–747Google Scholar
  14. 14.
    Prior RL, Wu X (2006) Anthocyanins: Structural characteristics that result in unique metabolic patterns and biological activities Free Rad Res 40(10) 1014–1028Google Scholar
  15. 15.
    Haldar S, Rowland IR, Barnett YA, Bradbury I, Robson PJ, Powell J, Fletcher J (2007) Influence of habitual diet on antioxidant status: a study in a population of vegetarians and omnivores Eur J Clin Nutr 61 1011–1022Google Scholar
  16. 16.
    Joubert E, Richards ES, Van der Merwe JD, De Beer D, Manley M, Gelderblom WCA (2008) Effect of species variation and processing on phenolic composition and in vitro antioxidant activity of aqueous extracts of Cyclopia spp (honeybush tea) J Agric Food Chem 56 954–963Google Scholar
  17. 17.
    Marnewick J, Gelderblom WCA, Joubert E (2000) An investigation on the antimutagenic properties of south African herbal teas Mutat Res 471(1-2) 157–166Google Scholar
  18. 18.
    Tsai P, Tsai T, Yu C, Ho S (2007) Comparison of NO-scavenging and NO-supressing activities of different herbal teas with those of green tea Food Chem 103 181–187Google Scholar
  19. 19.
    Hendricks R, Pool EJ (2010) The in vitro effects of Rooibos and Black tea on immune pathways J Immunoassay Immunochem 31 169–80Google Scholar
  20. 20.
    Joubert E, Schulz H (2006) Production and quality aspects of rooibos tea and related products. A review J Appl Botany 80(2) 138–144Google Scholar
  21. 21.
    Buyubalci A, El SN (2008) Determination of in vitro antidiabetic effects, antioxidant activities and phenol contents of some herbal teas Plant Foods Human Nutr 63 27–33Google Scholar
  22. 22.
    Kawano A, Nakamura H, Hata S, Minakawa M et al (2009) Hypoglycemic effect of aspalathin, a rooibos tea component from Aspalathus linearis, in type 2 diabetic model db/db mice Phytomedicine 16(5) 437–443Google Scholar
  23. 23.
    Özcan MM, Ünver A, Uçar T, Arslan D (2008) Mineral content of some herbs and herbal teas by infusion and decoction Food Chem 106 1128–1127Google Scholar
  24. 24.
    Özcan MM, Akbulut M (2007) Estimation of minerals, nitrate and nitrite contents of medicinal and aromatic plants used as spices, condiments and herbal tea Food Chem 106(2) 852–858Google Scholar
  25. 25.
    Malinowska E, Inkielewicz I, Czarnowski W, Szefer P (2008) Assessment of fluoride concentration and daily intake by human from tea and herbal infusions Food Chem Toxicol 46(3) 1055–1061Google Scholar
  26. 26.
    Ridker P M (1989) Health hazards of unusual herbal teas Am Family Physician 39(5) 153–156Google Scholar
  27. 27.
    Bennett JW, Klich M (2003) Mycotoxins Clin Microbiol Rev 16(3) 497–516Google Scholar
  28. 28.
    Neal MJ (2005) Medical pharmacology at a glance 5th edition, Mass: Blackwell, Malden, p 42–43Google Scholar
  29. 29.
    Kohno H, Kouda K, Tokunaga R (2007) Detection of estrogenic activity in herbal teas by in vitro reporter assays Eur Food Res Technol 225 913–920Google Scholar
  30. 30.
    Rogan WJ, Chen A (2005) Health risks and benefits of bis(4-chlorophenyl)-1,1,1-trichloroethane (DDT) Lancet 366 763–773Google Scholar
  31. 31.
    Naithani V, Kakkar P (2006) Estimation of organochlorine pesticide residues in two popular spices extensively used as herbal tea ingredients in India Environ Contam Toxicol 76 429–435Google Scholar
  32. 32.
    Wilson C, Dettenkofer M, Jonas D, Daschner F D (2004) Pathogen growth in herbal teas used in clinical setting a possible source of nosocomial infection? Am J Infect Control 32 117–119Google Scholar
  33. 33.
    Maliakal PP, Wanwimolruk S (2001) Effect of herbal teas on hepatic drug metabolizing enzymes in rats J Pharm Pharmacol 53(10) 1323–1329Google Scholar
  34. 34.
    Olson JA, Moon RC, Anders MW, Fenselau C, Shane B (1992) Enhancement of biological activity by conjugation reactions J Nutr 122(3) 615–624Google Scholar

Copyright information

© Springer and CEC Editore 2010

Authors and Affiliations

  1. 1.School of Pharmacy & Pharmaceutical SciencesManchesterUK

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