From the article,
"The present results also indicate that higher Dietary Antioxidant Capacity (DaC) before and during adjuvant treatment promotes a protective effect against exacerbation of oxidative stress provoked by it, and it appears that the variety of antioxidant sources is important to these results, since antioxidant molecules derived from food may act in synergism. Considering the need to develop strategies to promote the slight reduction in oxidative stress in order to reduce side effects, without affecting the efficacy of adjuvant treatment since the concurrent antioxidant supplementation may be harmful, our results may contribute to improving nutritional recommendations for these women. Further investigation may clarify the differences between supplementation and dietary intake of antioxidants, and analyze the direct impact of dietary antioxidant intake on side effects, and the efficacy of adjuvant treatment for breast cancer."
Reitz, L.K.; Schroeder, J.; Longo, G.Z.; Boaventura, B.C.B.; Di Pietro, P.F. Dietary Antioxidant Capacity Promotes a Protective Effect against Exacerbated Oxidative Stress in Women Undergoing Adjuvant Treatment for Breast Cancer in a Prospective Study. Nutrients 2021, 13, 4324. https://doi.org/10.3390/nu13124324