: Can Vitamin C and E supplements cure or manage Preeclampsia resulting from oxidative stress? According to Judith E. Brown's fifth edition of the "Nutrition Through Life Cycle" textbook, "Oxidative stress and lack of anitoxidant

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No. There have been several trials testing this and they have not shown benefit.

One example of the conclusion from such a trial:

Supplementation with vitamins C and E during pregnancy does not reduce the risk
of preeclampsia in nulliparous women, the risk of intrauterine growth restriction, or
the risk of death or other serious outcomes in their infants.

Rumbold, A. R., Crowther, C. A., Haslam, R. R., Dekker, G. A., & Robinson, J. S. (2006). Vitamins C and E and the risks of preeclampsia and perinatal complications. New England Journal of Medicine, 354(17), 1796-1806.

And a summary of 15 trials from the WHO, with a strong "not recommended" guidance:

Evidence related to the differential effects of
antioxidants in the prevention of pre-eclampsia
and its complications was extracted from a
Cochrane systematic review of 15 RCTs involving
a total of 22 359 women (14). Most of the trials
had compared one or more vitamins, particularly
combined vitamins C and E regimens, with
placebo. When antioxidants were compared with
placebo, there were no statistically significant
differences in the critical (and proxy) maternal
outcomes of pre-eclampsia

No statistical
differences were observed for any of the infantrelated critical (and proxy) outcomes addressed
in the trials

Individual or combined vitamin C and vitamin
E supplementation during pregnancy is not
recommended to prevent the development of
pre-eclampsia and its complications.
• (High-quality evidence.
Strong recommendation.)

World Health Organization. (2011). WHO recommendations for prevention and treatment of pre-eclampsia and eclampsia.