Common name: Holy basil, Tulsi
Botanical names: Ocimum sanctum, Ocimum tenuiflorum
© Martin Wall
Parts used and where grown
Holy basil is native to the Indian subcontinent and other parts of tropical Asia. The leaf and seed oil are used therapeutically.
Holy basil has been used in connection with the following conditions (refer to the individual health concern for complete information):
| Science Ratings | Health Concerns |
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 Reliable
and relatively consistent scientific data showing a substantial health benefit. Contradictory, insufficient, or preliminary studies
suggesting a health benefit or minimal health benefit. For an herb, supported by traditional use but minimal
or no scientific evidence. For a supplement, little scientific support and/or minimal health
benefit. |
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Historical or traditional use (may or may not be supported by scientific studies)
Holy basil is a relative of the more familiar species used in cooking. Known to the Ayurvedic medical tradition as tulsi, it has been called the “Queen of Herbs” since the times of ancient civilization in India.1 Ayurvedic tradition classifies tulsi as an adaptogenic herb, capable of increasing the body’s resistance to stress and disease.2 3 Its many specific uses have included coughs, colds, and other respiratory disorders, fevers, headaches, stomach disorders, and heart disease.
Active constituents
The stem and leaves of holy basil contain a variety of constituents that may have biological activity, including saponins, flavonoids, triterpenoids, and tannins.4 The leaf also contains an essential oil composed of eugenol and other volatile compounds.5 Several of these constituents have antioxidant and anti-inflammatory properties according to test tube studies.6 In animal studies, extracts of holy basil leaf have also lowered blood sugar,7 8 reduced some measures of the response to physical stresses,9 10 11 12 reduced pain sensitivity,13 14 protected heart tissue from excessive damage due to a heart attack,15 improved wound healing,16 17 and protected stomach tissue from damage from aspirin.18 Large amounts of holy basil extract were used in these studies, and few of these effects have been investigated in humans.
How much is usually taken?
Human clinical trials of holy basil typically use 1,000 to 2,500 mg per day of dried, powdered leaf, either taken all at once or divided into two or three smaller amounts.
Are there any side effects or interactions?
Two animal studies suggested that large amounts of holy basil might negatively affect fertility,19 20 but no adverse reactions have been reported in human clinical trials. Safety during pregnancy and lactation has not been investigated; until more is known, holy basil should probably be avoided at those times.21
At the time of writing, there were no well-known drug interactions with holy basil.
1. Singh N, Hoette Y. Tulsi: the mother medicine of nature. Lucknow, India: International Institute of Herbal Medicine, 2002.
2. Bhattacharya SK, Bhattacharya A, Chakrabarti A. Adaptogenic activity of Siotone, a polyherbal formulation of Ayurvedic rasayanas. Indian J Exp Biol 2000;38:119–28.
3. Wagner H, Norr H, Winterhoff H. Drugs with adaptogenic effects for strengthening the powers of resistance. Z Phytotherapie 1992;13:42–54.
4. Jaggi RK, Madaan R, Singh B. Anticonvulsant potential of holy basil, Ocimum sanctum Linn. and its cultures. Indian J Exp Biol 2003;41:1329–33.
5. Kelm MA, Nair MG, Strasburg GM, DeWitt DL. Antioxidant and cyclooxygenase inhibitory phenolic compounds from Ocimum sanctum Linn. Phytomedicine 2000;7:7–13.
6. Kelm MA, Nair MG, Strasburg GM, DeWitt DL. Antioxidant and cyclooxygenase inhibitory phenolic compounds from Ocimum sanctum Linn. Phytomedicine 2000;7:7–13.
7. Vats V, Grover JK, Rathi SS. Evaluation of anti-hyperglycemic and hypoglycemic effect of Trigonella foenum-graecum Linn, Ocimum sanctum Linn and Pterocarpus marsupium Linn in normal and alloxanized diabetic rats. J Ethnopharmacol 2002;79:95–100.
8. Kar A, Choudhary BK, Bandyopadhyay NG. Comparative evaluation of hypoglycaemic activity of some Indian medicinal plants in alloxan diabetic rats. J Ethnopharmacol 2003;84:105–8.
9. Bhargava KP, Singh N. Anti-stress activity of Ocimum sanctum Linn. Indian J Med Res 1981;73:443–51.
10. Sembulingam K, Sembulingam P, Namasivayam A. Effect of Ocimum sanctum Linn on noise induced changes in plasma corticosterone level. Indian J Physiol Pharmacol 1997;41:139–43.
11. Singh N. A pharmaco-clinical evaluation of some Ayurvedic crude plant drugs as anti-stress agents and their usefulness in some stress diseases of man. Ann Nat Acad Ind Med 1986;1:14–26.
12. Sood S, Narang D, Thomas MK, et al. Effect of Ocimum sanctum Linn. on cardiac changes in rats subjected to chronic restraint stress. J Ethnopharmacol 2006;108:423–7.
13. Khanna N, Bhatia J. Antinociceptive action of Ocimum sanctum (Tulsi) in mice: possible mechanisms involved. J Ethnopharmacol 2003;88:293–6.
14. Godhwani S, Godhwani JL, Vyas DS. Ocimum sanctum: an experimental study evaluating its anti-inflammatory, analgesic and antipyretic activity in animals. J Ethnopharmacol 1987;21:153–63.
15. Sharma M, Kishore K, Gupta SK, et al. Cardioprotective potential of ocimum sanctum in isoproterenol induced myocardial infarction in rats. Mol Cell Biochem 2001;225:75–83.
16. Shetty S, Udupa S, Udupa L, Somayaji N. Wound healing activity of Ocimum sanctum Linn with supportive role of antioxidant enzymes. Indian J Physiol Pharmacol 2006;50:163–8.
17. Udupa SL, Shetty S, Udupa AL, Somayaji SN. Effect of Ocimum sanctum Linn. on normal and dexamethasone suppressed wound healing. Indian J Exp Biol 2006;44:49–54.
18. Mandal S, Das DN, De K, et al. Ocimum sanctum Linn—a study on gastric ulceration and gastric secretion in rats. Indian J Physiol Pharmacol 1993;37:91–2.
19. Seth SD, Johri N, Sundaram KR. Antispermatogenic effect of Ocimum sanctum. Indian J Exp Biol 1981;19:975–6.
20. Kasinathan S, Ramakrishnan S, Basu SL. Antifertility effect of Ocimum sanctum L. Indian J Exp Biol 1972;10:23–5.
21. Brinker F. Herb Contraindications and Drug Interactions. Sandy, OR: Eclectic Medical Publications, 1998, 33–4.