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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1977 1
1981 1
1982 1
1983 1
1984 1
1985 4
1988 3
1989 3
1990 8
1991 11
1992 16
1993 28
1994 34
1995 34
1996 28
1997 50
1998 56
1999 57
2000 48
2001 52
2002 42
2003 62
2004 68
2005 42
2006 49
2007 54
2008 47
2009 49
2010 52
2011 50
2012 59
2013 53
2014 38
2015 27
2016 36
2017 35
2018 30
2019 16
2020 19
2021 17
2022 17
2023 19
2024 16
2025 13
2026 5

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1,246 results

Results by year

Filters applied: Meta-Analysis, Randomized Controlled Trial. Clear all
Page 1
Sunscreen and prevention of skin aging: a randomized trial.
Hughes MC, Williams GM, Baker P, Green AC. Hughes MC, et al. Ann Intern Med. 2013 Jun 4;158(11):781-90. doi: 10.7326/0003-4819-158-11-201306040-00002. Ann Intern Med. 2013. PMID: 23732711 Clinical Trial.
OBJECTIVE: To determine whether regular use of sunscreen compared with discretionary use or beta-carotene supplements compared with placebo retard skin aging, measured by degree of photoaging. ...INTERVENTION: Random assignment into 4 groups: daily use of broad-spec …
OBJECTIVE: To determine whether regular use of sunscreen compared with discretionary use or beta-carotene supplements compared …
Association between beta-carotene supplementation and risk of cancer: a meta-analysis of randomized controlled trials.
Zhang Y, Yang J, Na X, Zhao A. Zhang Y, et al. Nutr Rev. 2023 Aug 10;81(9):1118-1130. doi: 10.1093/nutrit/nuac110. Nutr Rev. 2023. PMID: 36715090
Existing studies have demonstrated that beta-carotene is associated with some positive health outcomes. However, results about the effects of supplemental beta-carotene on cancer are inconsistent. ...In addition, smokers and the subgroup of participant …
Existing studies have demonstrated that beta-carotene is associated with some positive health outcomes. However, results about …
Protection from sunburn with beta-Carotene--a meta-analysis.
Köpcke W, Krutmann J. Köpcke W, et al. Photochem Photobiol. 2008 Mar-Apr;84(2):284-8. doi: 10.1111/j.1751-1097.2007.00253.x. Epub 2007 Dec 15. Photochem Photobiol. 2008. PMID: 18086246
In this meta-analysis, we have systematically reviewed the existing literature on human supplementation studies on dietary protection against sunburn by beta-carotene. A review of literature until June 2007 was performed in PubMed, ISI Web of Science and EBM Cochran …
In this meta-analysis, we have systematically reviewed the existing literature on human supplementation studies on dietary protection agains …
Dietary beta-Carotene, Vitamin A, and Retinol Intake and Prevalence of Colorectal Adenoma: A Cross-Sectional Study and Meta-Analysis.
Chung J, Kang J, Kim SH, Jung MK, Kim DH, Song HJ, Kim KB, Nam SJ, Chun HJ, Lee JE, Lim YJ; Korean GI Nutrition Study Group(K-GINUS). Chung J, et al. Gut Liver. 2025 Nov 15;19(6):845-859. doi: 10.5009/gnl250104. Epub 2025 Aug 8. Gut Liver. 2025. PMID: 40776687 Free PMC article.
We investigated the relationship between dietary intake of beta-carotene, vitamin A, and retinol and the prevalence of colorectal adenoma using food frequency questionnaires (FFQs) and colonoscopy data. ...Meta-analysis confirmed a protective association for beta …
We investigated the relationship between dietary intake of beta-carotene, vitamin A, and retinol and the prevalence of colorec …
Low blood carotenoid status in dementia and mild cognitive impairment: A systematic review and meta-analysis.
Wang L, Zhao T, Zhu X, Jiang Q. Wang L, et al. BMC Geriatr. 2023 Mar 30;23(1):195. doi: 10.1186/s12877-023-03900-7. BMC Geriatr. 2023. PMID: 36997905 Free PMC article.
RESULTS: Our meta-analysis showed that patients with dementia had lower blood lycopene (SMD: -0.521; 95%CI: -0.741, -0.301), alpha-carotene (SMD: -0.489; 95%CI: -0.697, -0.281), beta-carotene (SMD: -0.476; 95%CI: -0.784, -0.168), lutein (SMD: -0.516; 95%CI: - …
RESULTS: Our meta-analysis showed that patients with dementia had lower blood lycopene (SMD: -0.521; 95%CI: -0.741, -0.301), alpha-carote …
The effects of beta-carotene on osteoporosis: a systematic review and meta-analysis of observational studies.
Gao SS, Zhao Y. Gao SS, et al. Osteoporos Int. 2023 Apr;34(4):627-639. doi: 10.1007/s00198-022-06593-7. Epub 2022 Nov 16. Osteoporos Int. 2023. PMID: 36380163
PURPOSE: The aim is to evaluate the effect of beta-carotene for osteoporosis and provide quantitative evidence. METHOD: PubMed, Embase, Web of Science, and Cochrane Library were searched for eligible studies. ...The risk of osteoporosis and fracture were compared be …
PURPOSE: The aim is to evaluate the effect of beta-carotene for osteoporosis and provide quantitative evidence. METHOD: PubMed …
Re-remembering the influence of randomized beta-carotene on cognitive decline.
Kopec RE, Chasman DI, Okereke OI, Sesso HD. Kopec RE, et al. Alzheimers Dement. 2023 Aug;19(8):3718-3721. doi: 10.1002/alz.13018. Epub 2023 Mar 20. Alzheimers Dement. 2023. PMID: 36939000 Clinical Trial.
As a motivating example, we highlight an ancillary report from the Physicians' Health Study, where subjects randomized to beta-carotene (a provitamin A carotenoid) had a more attenuated change in longitudinal global cognitive performance and verbal memory, as compar …
As a motivating example, we highlight an ancillary report from the Physicians' Health Study, where subjects randomized to beta-car …
The Associations of Plasma/Serum Carotenoids with Alzheimer's Disease: A Systematic Review and Meta-Analysis.
Qu M, Shi H, Wang K, Wang X, Yu N, Guo B. Qu M, et al. J Alzheimers Dis. 2021;82(3):1055-1066. doi: 10.3233/JAD-210384. J Alzheimers Dis. 2021. PMID: 34151808
Pooled analysis showed significantly lower plasma/serum levels of lutein (SMD = -0.86, 95% CI: -1.67 to -0.05, p = 0.04) and zeaxanthin (SMD = -0.59; 95% CI: -1.12 to -0.06, p = 0.03) in patients with AD versus cognitively intact controls, while alpha-carotene (SMD = 0.21, …
Pooled analysis showed significantly lower plasma/serum levels of lutein (SMD = -0.86, 95% CI: -1.67 to -0.05, p = 0.04) and zeaxanthin (SMD …
Vitamins C, E, and beta-Carotene and Risk of Type 2 Diabetes: A Systematic Review and Meta-Analysis.
Lampousi AM, Lundberg T, Löfvenborg JE, Carlsson S. Lampousi AM, et al. Adv Nutr. 2024 May;15(5):100211. doi: 10.1016/j.advnut.2024.100211. Epub 2024 Mar 15. Adv Nutr. 2024. PMID: 38493875 Free PMC article.
The lowest risk was seen at intakes of 70 mg/d of vitamin C (RR: 0.76; CI: 0.61, 0.95), 12 mg/d of vitamin E (RR: 0.72; CI: 0.61, 0.86), and 4 mg/d of beta-carotene (RR: 0.78; CI: 0.65, 0.94). Supplementation with vitamin E (RR: 1.01; CI: 0.93, 1.10) or beta- …
The lowest risk was seen at intakes of 70 mg/d of vitamin C (RR: 0.76; CI: 0.61, 0.95), 12 mg/d of vitamin E (RR: 0.72; CI: 0.61, 0.86), and …
Dietary, circulating beta-carotene and risk of all-cause mortality: a meta-analysis from prospective studies.
Zhao LG, Zhang QL, Zheng JL, Li HL, Zhang W, Tang WG, Xiang YB. Zhao LG, et al. Sci Rep. 2016 May 31;6:26983. doi: 10.1038/srep26983. Sci Rep. 2016. PMID: 27243945 Free PMC article.
Potential publication bias was assessed using Egger's and Begg's test. Seven studies that evaluated dietary beta-carotene intake in relation to overall mortality, indicated that a higher intake of beta-carotene was related to a significant lower risk o …
Potential publication bias was assessed using Egger's and Begg's test. Seven studies that evaluated dietary beta-carotene inta …
1,246 results