It seems currently there is no study published on the effect of vitamin A, C or E supplementation on metabolic syndrome. However, some observational studies provide evidence on the relationships.
A study by Godala et al on postmenopausal women with metabolic syndromes found that the optimal dietary intake levels of vitamin A, C and E was only observed in 3.6%, 8.9% and 11.4% of the patients respectively, implying supplementation may be prescribed to improve their vitamin status. (Reference: Article Should antioxidant vitamin supplementation be applied in pat...
) Similar finding was reported on the relationship between low plasma vitamin A, C and E levels and metabolic syndrome in patients by the same research team. (Reference:
Article The risk of plasma Vitamin A, C, e and D deficiency in patie...
) Please note that both are case-control study, which cannot prove the cause-and-effect relationship.
Apart from the research by Godala et al, we can find some preliminary evidence describing school-age children patients with metabolic syndroms had higher risk of having vitamin A insufficiency. (Reference: Article Serum vitamin A status is associated with obesity and the me...
) Another cross-sectional study also showed high vitamin C intake reduces metabolic syndrome incidence. (Reference:
Article Physical activity, dietary vitamin C, and metabolic syndrome...
) But all these are cross-sectional studies, which cannot prove the cause-and-effect relationship.
For vitamin E, current review suggests it is a potential intervention treatment for metabolic syndrome. You may refer to the reference: Article Vitamin E As a Potential Interventional Treatment for Metabo...
There seems to be dearth of data on supplementation of antioxidant vitamins in metabolic syndrome patients. However, in one study (link below) I have found that the concentration of several antioxidants (vit. A, C, E) is sub-optimal in adults with metabolic syndrome. This may partially explain their increased likelihood of having cardiovascular diseases and diabetes mellitus
1.Godala M, Materek-Kuśmierkiewicz I, Moczulski D, Rutkowski M, Szatko F, Gaszyńska E, Kowalski J.Estimation of plasma vitamin A, C and E levels in patients with metabolic syndrome].Pol Merkur Lekarski. 2014 May;36(215):320-3.
2.Godala M, Materek-Kuśmierkiewicz I, Moczulski D, Rutkowski M3, Szatko F, Gaszyńska E, Tokarski S, Kowalski J. The risk of plasma vitamin A, C, E and D deficiency in patients with metabolic syndrome: A case-control study. Adv Clin Exp Med. 2017 Jul;26(4):581-586. doi: 10.17219/acem/62453.
3.L. S. Bilbis, S. A. Muhammad, Y. Saidu, and Y. Adamu, “Effect of Vitamins A, C, and E Supplementation in the Treatment of Metabolic Syndrome in Albino Rats,” Biochemistry Research International, vol. 2012, Article ID 678582, 7 pages, 2012. https://doi.org/10.1155/2012/678582.
4.Małgorzata Godala, Izabela Materek-Kuśmierkiewicz, Dariusz Moczulski, Maciej Rutkowski, Franciszek Szatko4, Ewelina Gaszyńska, Sławomir Tokarski5, Jan Kowalski. The risk of plasma vitamin A, C, E and D deficiency in patients with metabolic syndrome: A case-control study; Advances in Clinical and Experimental Medicine, ISSN 1899-5276 (print), ISSN 2451-2680 (online).
5.Earl S. Ford, Ali H. Mokdad, Wayne H. Giles and David W. Brown. The Metabolic Syndrome and Antioxidant Concentrations; Diabetes 2003 Sep; 52(9): 2346-2352.
6.MingjingGao,ZhenZhao,PengyuLv,YuFangLi, JuntaoGao, MichaelZhang, BaoluZhao.Quantitative combination of natural anti-oxidants prevents metabolic syndrome by reducing oxidative stress; Redox Biology;Volume 6, December 2015, Pages 206-217
7.Garcia-Bailo et al. Vitamins D, C, and E in the prevention of type 2 diabetes mellitus: modulation of inflammation and oxidative stress; Biologics: Targets & Therapy 2011:5 7–19
8.Sok Kuan Wong, Kok-Yong Chin, Farihah Hj Suhaimi, Fairus Ahmad and Soelaiman Ima-Nirwana; Vitamin E As a Potential Interventional Treatment for Metabolic Syndrome: Evidence from Animal and Human Studies; Pharmacol., 05 July 2017 | https://doi.org/10.3389/fphar.2017.00444