can i take vitamin c before colonoscopy

Although vitamin A is known to be important for bone growth, taking excess vitamin A is not necessarily beneficial. J Chiropr.Med 2006;5(1):2-12. Int J Epidemiol. Domingo JL, Gomez M, Llobet JM, Richart C. Effect of ascorbic acid on gastrointestinal aluminum absorption (letter). Interact.Cardiovasc.Thorac.Surg. View abstract. Lancet 11-7-1992;340(8828):1124-1127. Taking vitamin C by mouth together with beta-carotene plus vitamin E does not seem to prevent pancreatic cancer. Am.J Clin.Nutr 1973;26(6):591-594. Int J Fertil 1977;22:168-73. View abstract. View abstract. However, Dulcolax itself may take 6 to 12 hours to work. Effects of oral vitamin C supplementation on oxidative stress and inflammation status in haemodialysis patients. Drink extra liquids before, during, and after your bowel prep (usually until a few hours . View abstract. View abstract. J Am Coll Cardiol. Sleep Med. Bishop, N., Schorah, C. J., and Wales, J. K. The effect of vitamin C supplementation on diabetic hyperlipidaemia: a double blind, crossover study. View abstract. European Prospective Investigation into Cancer and Nutrition. View abstract. J Clin Pharmacol 1978;18:21-8. 2000;9(7):647-652. I can understand your concern. Loria CM, Klag MJ, Caulfield LE, Whelton PK. FALSE. Barefoot, J. C., Larsen, S., von der, Lieth L., and Schroll, M. Hostility, incidence of acute myocardial infarction, and mortality in a sample of older Danish men and women. Nurmatov, U., Devereux, G., and Sheikh, A. Nutrients and foods for the primary prevention of asthma and allergy: systematic review and meta-analysis. 9-20-1990;323(12):789-795. Med Klin 9-15-1997;92 Suppl 3:29-31. Myung, S. K., Ju, W., Kim, S. C., and Kim, H. Vitamin or antioxidant intake (or serum level) and risk of cervical neoplasm: a meta-analysis. View abstract. Enstrom, J. E., Kanim, L. E., and Breslow, L. The relationship between vitamin C intake, general health practices, and mortality in Alameda County, California. View abstract. (2016). The effect of antioxidant supplementation on a serum marker of free radical activity and abnormal serum biochemistry in alcoholic patients admitted for detoxification. Verhoeven, D. T., Assen, N., Goldbohm, R. A., Dorant, E., van, 't, V, Sturmans, F., Hermus, R. J., and Van den Brandt, P. A. Vitamins C and E, retinol, beta-carotene and dietary fibre in relation to breast cancer risk: a prospective cohort study. A day before the colonoscopy, patients need to consume clear liquids only. Clin Biochem. Pharmacol.Res 1999;40(3):227-238. Paganini-Hill, A. 8 Pain after surgery. View abstract. Mahomed, K. Zinc supplementation in pregnancy. Am J Emerg Med 2021;50:242-250. For instance, a study from the journal Medicine found low compliance with diet instructions. Hennekens CH, Buring JE, Manson JE, et al. Eur.J Clin.Nutr 2006;60(8):991-999. View abstract. Lee IM, Cook NR, Manson JE, et al. 2013;2(6):e000329. Lasers Surg.Med 2000;26(2):208-214. Effect of vitamin C on frequency of reflex sympathetic dystrophy in wrist fractures: a randomized trial. Manriquez, J. J., Majerson, Gringberg D., and Nicklas, Diaz C. Wrinkles. Z.Rheumatol. View abstract. View abstract. A randomized trial of vitamins C and E in the prevention of recurrence of colorectal polyps. In most cases, youll need to reschedule your colonoscopy procedure. 1981;25(4):348-350. 2012;13(5):542-5. 2000;135(3):326-331. Nouvelles Dermatologiques 1995;14:585-591. Sezikli M, etinkaya ZA, Gzelbulut F, et al. Human HL-60 myeloid leukemia cells transport dehydroascorbic acid via the glucose transporters and accumulate reduced ascorbic acid. 1989;140(5):1312-1316. Bleys, J., Miller, E. R., III, Pastor-Barriuso, R., Appel, L. J., and Guallar, E. Vitamin-mineral supplementation and the progression of atherosclerosis: a meta-analysis of randomized controlled trials. Hajjar, I. M., George, V., Sasse, E. A., and Kochar, M. S. A randomized, double-blind, controlled trial of vitamin C in the management of hypertension and lipids. Arch Intern Med 1992;152(7):1416-1424. View abstract. Ann Intern Med 2005;142:60520-53. J Drugs Dermatol. It is not clear if this interaction is a big concern. 2012;7(8):e42626. Relationship of serum vitamin C and globulin fractions with anthropometric measurements in adults. Zhonghua Yu Fang Yi.Xue.Za Zhi. View abstract. Dr. Zayed graduated from Alexandria University in 2010 with a faculty of medicine degree. Adverse effects from vitamin C are only seen in those taking supplements. S.Afr.Med J 12-20-1975;49(54):2225-2228. View abstract. Am.J Clin.Nutr 1981;34(10):2088-2091. Am J Respir Crit Care Med 2006;174:499-507. View abstract. View abstract. Effect of vitamin C on lipoproteins in healthy adults. For example, calcium and vitamin D are taken at the same time, but calcium prevents the absorption of iron from the gut, so calcium and iron should be taken at separate times. For example, it's better to take vitamin B12 in the morning for this reason. Taking vitamin C by mouth along with other antioxidants does not seem to prevent death. View abstract. 2-15-1993;137(4):393-403. The doctor may adjust the dosages of specific medications or instruct patients to stop taking them temporarily. View abstract. Marchioli, R. Antioxidant vitamins and prevention of cardiovascular disease: laboratory, epidemiological and clinical trial data. Step 1: Take a plastic soda or water bottle and fill it with drinkable water. Monongahela Valley Independent Elders Survey. Ophthalmology 1998;105(12):2264-2270. Keven, K., Kutlay, S., Nergizoglu, G., and Erturk, S. Randomized, crossover study of the effect of vitamin C on EPO response in hemodialysis patients. Podoshin L, Gertner R, Fradis M. Treatment of perennial allergic rhinitis with ascorbic acid solution. View abstract. Chen WT, Yan HC, Yu FC. Aliment.Pharmacol.Ther. This is called bowel prep or colon prep. Other foods include black tea or coffee, popsicles, and Jell-O. Scand J Rheumatol 2001;30:208-12.. View abstract. View abstract. Sadat U, Usman A, Gillard JH, Boyle JR. (n.d.). Effects of vitamin C supplementation on blood pressure: a meta-analysis of randomized controlled trials. Pandey, D. K., Shekelle, R., Selwyn, B. J., Tangney, C., and Stamler, J. Dietary vitamin C and beta-carotene and risk of death in middle-aged men. Vitamin C supplements may even be harmful. Hum.Nutr Clin.Nutr 1985;39(6):427-437. Eslami, M., Badkoubeh, R. S., Mousavi, M., Radmehr, H., Salehi, M., Tavakoli, N., and Avadi, M. R. Oral ascorbic acid in combination with beta-blockers is more effective than beta-blockers alone in the prevention of atrial fibrillation after coronary artery bypass grafting. Consuming healthy foods that contain vitamin C is not only the preferred way to . Kirsh VA, Hayes RB, Mayne ST, et al. Baseline characteristics and the effect of selenium supplementation on cancer incidence in a randomized clinical trial: a summary report of the Nutritional Prevention of Cancer Trial. Correlation of blood pressure with plasma ascorbic acid. Chung MK, Kim do H, Ahn YC, Choi JY, Kim EH, Son YI. Front Cardiovasc Med 2022;9:789729. 2007; Nunez, C., Carbajal, A., Belmonte, S., Moreiras, O., and Varela, G. [A case control study of the relationship between diet and breast cancer in a sample from 3 Spanish hospital populations. View abstract. Lewis, S. A., Antoniak, M., Venn, A. J., Davies, L., Goodwin, A., Salfield, N., Britton, J., and Fogarty, A. W. Secondhand smoke, dietary fruit intake, road traffic exposures, and the prevalence of asthma: a cross-sectional study in young children. Multicentric study of efficacy of periconceptional folic acid containing vitamin supplementation in prevention of open neural tube defects from India. View abstract. Respir.Res 2008;9:67. Ness, A. R., Chee, D., and Elliott, P. Vitamin C and blood pressure--an overview. Opinion of the Scientific Panel on Dietetic Products, Nutrition and Allergies on a request from the Commission related to the Tolerable Upper Intake Level of Vitamin C (L-Ascorbic acid, its calcium, potassium and sodium salts and L-ascorbyl-6-palmitate). 2017;37:58-64. Virtamo, J., Edwards, B. K., Virtanen, M., Taylor, P. R., Malila, N., Albanes, D., Huttunen, J. K., Hartman, A. M., Hietanen, P., Maenpaa, H., Koss, L., Nordling, S., and Heinonen, O. P. Effects of supplemental alpha-tocopherol and beta-carotene on urinary tract cancer: incidence and mortality in a controlled trial (Finland). Rosenthal G. Interaction of ascorbic acid and warfarin. View abstract. View abstract. A., Rich-Edwards, J. W., Weiss, S. T., Gold, D. R., Kleinman, K., and Gillman, M. W. Maternal intake of vitamin D during pregnancy and risk of recurrent wheeze in children at 3 y of age. J Okla.State Med Assoc. View abstract. Johnson, C. C., Gorell, J. M., Rybicki, B. 2002;443(5-6):791-797. Taverner, D. and Latte, J. Nasal decongestants for the common cold. J Am Coll Nutr. understand that may opt out of bensnaturalhealth The folic acid group showed a significant increase in cancer outcomes and mortality compared to those on the placebos. Curr Rev Clin Exp Pharmacol 2022;17(3):205-215. Keller KL, Fenske NA. Pediatr Pulmonol 1994;18:34-8. A meta-analysis of randomized controlled trials of low-volume polyethylene glycol plus ascorbic acid versus standard-volume polyethylene glycol solution as bowel preparations for colonoscopy. Am J Clin Nutr 1999;69:261-6. Pediatr Neonatol 2021. View abstract. Aesthet Surg J. Altern.Ther.Health Med. View abstract. The effect of vitamin C supplementation on lipid profile of type 2 diabetic patients: a systematic review and meta-analysis of clinical trials. Taking vitamin C by mouth does not seem to prevent bladder cancer or reduce bladder cancer-related deaths. Can.Med Assoc.J 9-23-1972;107(6):503-508. Gulmezoglu AM, Hofmeyr GJ, Oosthuisen MM. View abstract. Maturitas 2002;42:129-35. Int J Vitam Nutr Res Suppl 1982;23:83-90. View abstract. View abstract. Prospective randomized controlled mulitcenter trial applying subatmospheric pressure to acute hand burns: an interim report. View abstract. Am J Med 1977;62:71-6. Robman, L. D., Tikellis, G., Garrett, S. K., Harper, C. A., McNeil, J. J., Taylor, H. R., and McCarty, C. A. Baseline ophthalmic findings in the vitamin E, cataract and age-related maculopathy (VECAT) study. View abstract. View abstract. Progression of early atherosclerosis and intake of vitamin C and vitamin E from supplements and food. View abstract. 2003;42(1):158-166. A 2016 review in the Advanced Pharmaceutical Bulletin reviewed all the good quality randomized controlled trials on the use of vitamins between 1993 -2015. View abstract. A randomised, double blind, placebo-controlled study. Cooper, K., Squires, H., Carroll, C., Papaioannou, D., Booth, A., Logan, R. F., Maguire, C., Hind, D., and Tappenden, P. Chemoprevention of colorectal cancer: systematic review and economic evaluation. Int J Cancer 2000;86:122-7.. View abstract. Lee DH, Folsom AR, Harnack L, et al. Influence of oral contraceptives on ascorbic acid and triglyceride status. Hercberg S, Galan P, Preziosi P, et al. Cancer Epidemiol Biomarkers Prev 2002;11:630-9.. View abstract. Heimer, K. A., Hart, A. M., Martin, L. G., and Rubio-Wallace, S. Examining the evidence for the use of vitamin C in the prophylaxis and treatment of the common cold. Am.J Clin.Nutr 2007;85(3):788-795. Am.J Public Health 1986;76(9):1124-1130. View abstract. View abstract. 1984;54(1):55-60. Lee HP, Gourley L, Duffy SW, et al. View abstract. Circ Cardiovasc Qual Outcomes. View abstract. Clin Ther. For seven days prior to the colonoscopy, we ask that you avoid taking supplements that contain iron , as this may discolor the colon, making visualization and detection of polyps more difficult. Supplemental vitamins and minerals for CVD prevention and treatment. Am J Med Technol 1983;49:23-6. Failure of high-dose vitamin C (ascorbic acid) therapy to benefit patients with advanced cancer. These can cause bleeding. Vitamine, Mineralstoffe, Spurenelemente 1987;2:137-142. Poston, L., Briley, A. L., Seed, P. T., Kelly, F. J., and Shennan, A. H. Vitamin C and vitamin E in pregnant women at risk for pre-eclampsia (VIP trial): randomised placebo-controlled trial. Antioxidant vitamins or lactulose for the prevention of the recurrence of colorectal adenomas. The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers. J Agric Food Chem 2003;51:4291-5. [Vitamin C and the common cold]. View abstract. A consequence of megavitamin therapy. Int J Dent 2022;2022:6437200. View abstract. Grievink, L., Smit, H. A., Veer, P., Brunekreef, B., and Kromhout, D. Plasma concentrations of the antioxidants beta-carotene and alpha-tocopherol in relation to lung function. Vitamin E Side effects are rare. 1959;14:288-290. Efficacy of vitamins C, E, and their combination for treatment of restless legs syndrome in hemodialysis patients: a randomized, double-blind, placebo-controlled trial. Nutr Cancer 1984;6(3):187-195. View abstract. Miller, J. FRANZ, W. L., HEYL, H. L., and SANDS, G. W. Blood ascorbic acid level in bioflavonoid and ascorbic acid therapy of common cold. Anon. View abstract. No effect on serum lipids by moderate and high doses of vitamin C in elderly subjects with low plasma ascorbic acid levels. This is important to avoid potential side effects. Gilliland, F. D., Berhane, K. T., Li, Y. F., Gauderman, W. J., McConnell, R., and Peters, J. Tareke AA, Hadgu AA. Weininger J, King JC. View abstract. View abstract. A., and Buring, J. E. A prospective study of cigarette smoking and risk of age-related macular degeneration in men. Acute kidney disease due to excessive vitamin C ingestion and remote Roux-en-Y gastric bypass surgery superimposed on CKD. View abstract. View abstract. J Gastroenterol Hepatol. Large amounts of vitamin C can decrease how quickly the body breaks down acetaminophen. 2017 Feb;39(2):378-403. View abstract. View abstract. International Journal of Geriatric Psychiatry 1989;4:333-338. Buzzard, I. M., McRoberts, M. R., Driscoll, D. L., and Bowering, J. J Pediatr.Gastroenterol.Nutr. In the UK, calcium and vitamin D supplementation is recommended for perimenopausal or postmenopausal women at risk of. Clifford T, Jeffries O, Stevenson EJ, Davies KAB. Kim TK, Lim HR, Byun JS. View abstract. Free Rad Biol Med 1999;27:309-14. In particular, most people are familiar with the idea that a person must take laxatives to clear their bowels. Meyskens, F. L., Jr., Kopecky, K. J., Appelbaum, F. R., Balcerzak, S. P., Samlowski, W., and Hynes, H. Effects of vitamin A on survival in patients with chronic myelogenous leukemia: a SWOG randomized trial. 1. JAMA 3-15-1976;235(11):1108. Dtsch.Gesundheitsw. 2014;29(6):1223-8. Lingstrom, P., Fure, S., Dinitzen, B., Fritzne, C., Klefbom, C., and Birkhed, D. The release of vitamin C from chewing gum and its effects on supragingival calculus formation. Z., Lynch, J. M., Shaffer, G. W., and George, D. A. 1989;42(7):625-631. View abstract. Simon JA, Hudes ES. Falsaperla, M., Morgia, G., Tartarone, A., Ardito, R., and Romano, G. Support ellagic acid therapy in patients with hormone refractory prostate cancer (HRPC) on standard chemotherapy using vinorelbine and estramustine phosphate. Traikovich SS. Comparison of antioxidant efficacy of vitamin E, vitamin C, vitamin A and fruits in coronary heart disease: a controlled trial. 1981;43(1):174-179. 8. Vitamin C antagonizes the cytotoxic effects of antineoplastic drugs. Prostate cancer and supplementation with alpha-tocopherol and beta-carotene: incidence and mortality in a controlled trial. Polyzos, N. P., Mauri, D., Tsappi, M., Tzioras, S., Kamposioras, K., Cortinovis, I., and Casazza, G. Combined vitamin C and E supplementation during pregnancy for preeclampsia prevention: a systematic review. The Iowa Women's Health Study. Hopkins, R., Bird, H. A., Jones, H., Hill, J., Surrall, K. E., Astbury, C., Miller, A., and Wright, V. A double-blind controlled trial of etretinate (Tigason) and ibuprofen in psoriatic arthritis. Xie Q, Chen L, Zhao F, et al. MRC Vitamin Study Research Group. View abstract. View abstract. View abstract. View abstract. Vitamin C supplements may even be harmful. Gastrointest Endosc. Stanton, J. L., Braitman, L. E., Riley, A. M., Jr., Khoo, C. S., and Smith, J. L. Demographic, dietary, life style, and anthropometric correlates of blood pressure. Combined vitamin C and E supplementation for the prevention of preeclampsia: a systematic review and meta-analysis. Haslam RH, Dalby JT, Rademaker AW. However, taking vitamin A supplements does not seem to have the same effects. Kershner J, Hawke W. Megavitamins and learning disorders: a controlled double-blind experiment. Nutr Hosp. Levi, F., La Vecchia, C., Gulie, C., and Negri, E. Dietary factors and breast cancer risk in Vaud, Switzerland. During the test, the doctor can take samples of tissue that can be checked for cancer or other problems. View abstract. Circulation 1993;88(6):2771-2779. Adams, J. The UL is not stated on the product label. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. to receive emails from bensnaturalhealth and I chemotherapy in patients with advanced cancer: a phase I-II clinical trial. Thorax 1997;52(7):628-633. Farahani-Jam S, Yaghmaei M, Vahdat Shariatpanahi Z. View abstract. The Effect of Combined Vitamin C and Vitamin E Supplementation on Oxidative Stress Markers in Women with Endometriosis: A Randomized, Triple-Blind Placebo-Controlled Clinical Trial. Clin Nutr. 2020;34(2):409-416. Foot Ankle Surg 2019;25(4):542-5. doi: 10.1016/j.fas.2018.05.001. Circulation 1999;99:591-5. Asia Pac.J Public Health 1994;7(2):98-104. Kelly, A. M., Dwamena, B., Cronin, P., Bernstein, S. J., and Carlos, R. C. Meta-analysis: effectiveness of drugs for preventing contrast-induced nephropathy. Am J Clin Nutr 1993;57(4):506-511. View abstract. Int J Cosmet Sci. J Nutr 2005;135(7):1776-1781. View abstract. You can go for stool culture and sensitivity tests to know about the infection. Am J Clin Nutr 1975;28:550-4. J Am.Coll.Nutr 1999;18(3):213-222. Grievink, L., Smit, H. A., Ocke, M. C., Van, 't, V, and Kromhout, D. Dietary intake of antioxidant (pro)-vitamins, respiratory symptoms and pulmonary function: the MORGEN study. Am J Clin Nutr. View abstract. Basaran, A., Basaran, M., and Topatan, B. Take your vitamin D supplements exactly as directed and do not be tempted to take too much. View abstract. 2017 Nov;152(5):954-962. Heinle, K., Adam, A., Gradl, M., Wiseman, M., and Adam, O. Hijazi, N., Abalkhail, B., and Seaton, A. Epidemiology 1992;3:194-202.. View abstract. Lancet 2002;359:1648-54.. View abstract. View abstract. View abstract. McCarty, M. F. Scavenging of peroxynitrite-derived radicals by flavonoids may support endothelial NO synthase activity, contributing to the vascular protection associated with high fruit and vegetable intakes. Drug interaction between ascorbic acid and fluphenazine. View abstract. Eur.J Clin.Nutr 2007;61(4):443-460. Srisupandit, S., Pootrakul, P., Areekul, S., Neungton, S., Mokkaves, J., Kiriwat, O., and Kanokpongsukdi, S. A prophylactic supplementation of iron and folate in pregnancy. View abstract. Negri E, Franceschi S, Bosetti C, et al. B. View abstract. Br J Nutr. View abstract. Thorax 2006;61(12):1048-1053. 5-15-2000;151(10):975-981. View abstract. A., Jr. Life Sci 6-1-2001;69(2):223-228. Kligler, B., Homel, P., Blank, A. E., Kenney, J., Levenson, H., and Merrell, W. Randomized trial of the effect of an integrative medicine approach to the management of asthma in adults on disease-related quality of life and pulmonary function. Circulation 1992;85:865. Clin Exp.Hypertens. 2008;52(7):789-98. doi:10.1002/mnfr.200700113, Chrubasik-hausmann S, Vlachojannis J, Mclachlan AJ. B., Zhao, G. M., Ruan, Z. X., Cheng, J. R., Zheng, W., and Shu, X. O. Nutritional factors in relation to endometrial cancer: a report from a population-based case-control study in Shanghai, China. Intraoperative haemorrhage associated with the use of extract of Saw Palmetto herb: a case report and review of literature. At high doses, vitamin A can cause liver toxicity you should not drink alcohol when taking any vitamin, A supplements. Save my name, email, and website in this browser for the next time I comment. Low-fiber diet stops a day before the procedure. Progresos de Obstetricia y Ginecologia 1982;25(6):381-386. Ponz de, Leon M. and Roncucci, L. Chemoprevention of colorectal tumors: role of lactulose and of other agents. View abstract. Some hospitals or clinics require patients to stop drinking fluids longer than a few hours before the procedure. Heaney ML, Gardner JR, Karasavvas N, et al. J.Pediatr. 2008;(2):CD007176. Carr AB, Einstein R, Lai LY, et al. View abstract. Associations between intermediate age-related macular degeneration and lutein and zeaxanthin in the Carotenoids in Age-related Eye Disease Study (CAREDS): ancillary study of the Women's Health Initiative. Lakartidningen 7-5-1972;69(28):3304-3305. after swallowing a vitamin tablet, you must seek urgent help immediately. Alzheimer Dis Assoc Disord 1998;12:121-6. View abstract. Brody S, Preut R, Schommer K, Schurmeyer TH. View abstract. Am J Respir Crit Care Med 1995;151:1401-8. View abstract. View abstract. Br Med J (Clin Res Ed) 1981;283:503. View abstract. The effects of supplemental oral iron administration to pregnant women. Effect of vitamin C supplementation on lipoprotein cholesterol, apolipoprotein, and triglyceride concentrations. Melchart D, Linde K, Fischer P, Kaesmayr J. Echinacea for preventing and treating the common cold. Leukocyte ascorbic acid and its relationship to coronary artery disease in man. View abstract. 2016;155(3):423-30. For professional medical information on natural medicines, see Natural Medicines Comprehensive Database Professional Version. Am.J Clin.Nutr 1986;44(4):444-448. The effects of supplementation with alpha-tocopherol and beta-carotene on the incidence and mortality of carcinoma of the pancreas in a randomized, controlled trial. View abstract. 2011;(9):CD008011. A clinical trial of antioxidant vitamins to prevent colorectal adenoma. Lancet 4-28-1990;335(8696):1013-1016. Anderson, C., Checkoway, H., Franklin, G. M., Beresford, S., Smith-Weller, T., and Swanson, P. D. Dietary factors in Parkinson's disease: the role of food groups and specific foods. Preparing for a colonoscopy is far from the most enjoyable experience youll have in your life but its a critical one. Potential antiatherogenic mechanisms of ascorbate (vitamin C) and alpha-tocopherol (vitamin E). Nutrition 1996;12:804-9.. View abstract. Rahimi, R., Nikfar, S., Rezaie, A., and Abdollahi, M. A meta-analysis on the efficacy and safety of combined vitamin C and E supplementation in preeclamptic women. These medications include those for diabetes, hypertension, and heart problems. For example, you need to avoid eating specific foods. Clin.Evid.(Online.) Effect of iron-, iodine-, and beta-carotene-fortified biscuits on the micronutrient status of primary school children: a randomized controlled trial. Yimcharoen M, Kittikunnathum S, Suknikorn C, et al. Dig.Liver Dis. But this decrease in time is less than 10%. 2003;77(1):150-159. doi:10.4103/0974-8520.110515, Freeman C, Spelman K. A critical evaluation of drug interactions with Echinacea spp. Turk.J Pediatr. Am J Med 2001;111:103-8. View abstract. Biol.Trace Elem.Res. Topical tretinoin improves photo-aged skin. JAMA 2003;290:2824-30.. View abstract. View abstract. 1996;67(1):12-29. 1-15-1993;137(2):155-165. Be sure to have your blood checked regularly. Lapidus, L., Andersson, H., Bengtsson, C., and Bosaeus, I. Dietary habits in relation to incidence of cardiovascular disease and death in women: a 12-year follow-up of participants in the population study of women in Gothenburg, Sweden. Padayatty SJ, Levine M. New insights into the physiology and pharmacology of vitamin C. CMAJ 2001;164:353-5. 2005;192(2):520-521. Blot WJ, Li JY, Taylor PR. View abstract. Circulation 1998;97:363-8. Dawson EB, Evans DR, Harris WA, et al. Lancet 1-5-1991;337(8732):1-5. View abstract. View abstract. Anderson, T. W., Suranyi, G., and Beaton, G. H. The effect on winter illness of large doses of vitamin C. Can.Med Assoc.J 7-6-1974;111(1):31-36. People generally believe that vitamins must be safe, and that even if they don't result in any benefit, they are unlikely to cause harm. Isr.Med Assoc.J 2004;6(12):742-746. Gerontology 1994;40(5):268-272. View abstract. Richer, S. Multicenter ophthalmic and nutritional age-related macular degeneration study--part 2: antioxidant intervention and conclusions. Can contrast-induced CT scans show tumors? Atherosclerosis 1981;39(1):89-95. geriatric network.