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Some that you should avoid: St. John's wort. Eksp Klin Farmakol 2009;72:61-5. View abstract.Hodgson JM, Puddey IB, Croft KD, et al.

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Efficacy of calcium supplements on bone mass in postmenopausal women.

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2015;34(4):612-9. View abstract.Cesana M, Broccali G, Imbimbo BP, Crema A. Loktionov, A., Bingham, S. A., Vorster, H., Jerling, J. C., Runswick, S. A., and Cummings, J. H. Apolipoprotein E genotype modulates the effect of black tea drinking on blood lipids and blood coagulation factors: a pilot study. View abstract.Heseltine D, Dakkak M, woodhouse K, et al. Fluvoxamine (Luvox) can decrease how quickly the body breaks down caffeine. View abstract. View abstract. The body breaks down caffeine to get rid of it. View abstract.Hartley L, Flowers N, Holmes J, Clarke A, Stranges S, Hooper L, Rees K. Green and black tea for the primary prevention of cardiovascular disease. Birth View abstract.Maron DJ, Lu GP, Cai NS, et al. 2001;85(4):358-364. 2014 19;9(9):e107711. Effect of three caffeine doses on plasma catecholamines and alertness during prolonged wakefulness. View abstract. No effect of consumption of green and black tea on plasma lipid and antioxidant levels and on LDL oxidation in smokers. J Allergy Clin.Immunol. Effect of decaffeinated versus regular coffee on blood pressure. Steptoe, A., Gibson, E. L., Vuononvirta, R., Williams, E. D., Hamer, M., Rycroft, J. Cleve Clin J Med 2002;69:449-50. Some antibiotics might decrease how quickly the body breaks down caffeine. Zhongguo Zhong Yao Za Zhi 2009;34:2079-82. Decreasing how well warfarin (Coumadin) slows blood clotting might increase the risk of clotting.

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Mutat.Res. Taking St. John's wort with one of these anti-HIV drugs could reduce the drug's effect. Available at: http://cerhr.niehs.nih.gov/common/caffeine.html.Tu YY, Tang AB, Watanabe N. The theaflavin monomers inhibit the cancer cells growth in vitro. Chow, W. H., Swanson, C. A., Lissowska, J., Groves, F. D., Sobin, L. H., Nasierowska-Guttmejer, A., Radziszewski, J., Regula, J., Hsing, A. W., Jagannatha, S., Zatonski, W., and Blot, W. J. J Agric Food Chem 1993;41(8):1242-1246. View abstract.Cannon ME, Cooke CT, McCarthy JS. Eur J Clin Pharmacol 1989;37:279-83. 2006;(4):CD001829. 7-1-2001;61(13):5002-5009. If you are breast-feeding, drinking more than 3 cups a day of black tea is Black tea contains caffeine. The body breaks down caffeine to get rid of it. Clin Exp Pharmacol Physiol 1996;23:559-63. View abstract. Risk of stomach cancer in relation to consumption of cigarettes, alcohol, tea and coffee in Warsaw, Poland. View abstract.Carbo M, Segura J, De la Torre R, et al. Theaflavin-3, 3'-digallate induces epidermal growth factor receptor downregulation. 2-1-1996;77(4):270-274. Arch Intern Med 2003;163:1448-53.. View abstract.Massey LK, Whiting SJ.

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