Cancer Prevention through Antioxidant Consumption

Evidence from Cancer Prevention Guidelines

The American Cancer Society recommends obtaining antioxidants through food sources rather than supplements, as clinical studies of antioxidant supplements have not demonstrated a reduction in cancer risk 1, 2, 3, 4, 5
Studies suggest that people who eat more vegetables and fruits, which are rich sources of antioxidants, have a lower risk for some types of cancer 1, 2, 3
The American Cancer Society states that while antioxidants found naturally in vegetables and fruits are associated with lower cancer risk, clinical studies of antioxidant supplements have not demonstrated a reduction in cancer risk 1, 2, 3, 4, 5

During cancer treatment, most oncologists advise against taking higher doses of supplements with antioxidant activity during chemotherapy or radiotherapy because antioxidants could repair cellular oxidative damage to cancer cells that contributes to the effectiveness of these treatments 6
Six small randomized trials evaluated glutathione against platinum-based neurotoxicity, with mixed results—five showed benefit for neuropathy reduction, but one larger trial failed to demonstrate benefit for taxane-induced neuropathy 7

For cancer prevention, the American Cancer Society recommends focusing on consuming at least five servings of vegetables and fruits daily rather than taking glutathione or other antioxidant supplements 1, 2, 3, 4, 5
To reduce cancer risk, the best advice presently is to consume antioxidants through food sources rather than supplements 1, 2, 3, 8

The American Cancer Society advises that protective compounds such as sulforaphane should be obtained primarily from whole‑food sources (e.g., broccoli, broccoli sprouts, Brussels sprouts, cauliflower), because these foods provide sulforaphane together with other synergistic phytochemicals that contribute to cancer‑preventive effects【9】.

The American Cancer Society recommends against the routine use of high‑dose sulforaphane supplements for cancer prevention, noting that supplement trials have not demonstrated the same protective benefits as dietary intake and that whole foods offer a broader spectrum of active constituents【10】.