Cruciferous vegetables, such as broccoli, cabbage, and Brussels sprouts, are rich in glucosinolates, which break down into bioactive compounds like isothiocyanates and indoles. These compounds have been linked to reduced cancer risk, particularly for lung and colorectal cancers, in some epidemiological studies. However, evidence for their protective effects against breast and prostate cancer is limited and inconsistent. Genetic variations in metabolism can influence how these compounds affect cancer risk. Isothiocyanates and indoles, such as sulforaphane and indole-3-carbinol (I3C), may have anticarcinogenic properties, but some studies suggest potential harmful effects. Cooking methods can affect the bioavailability of these compounds. I3C and its derivative DIM may alter estrogen metabolism, but their impact on breast cancer risk is unclear. While some preliminary trials suggest I3C may help in treating HPV-related conditions, larger studies are needed. Although many organizations recommend 5–9 servings of fruits and vegetables daily, specific guidelines for cruciferous vegetables are lacking. Further research is needed to understand the mechanisms and individual variability in the effects of cruciferous vegetables on cancer risk.Cruciferous vegetables, such as broccoli, cabbage, and Brussels sprouts, are rich in glucosinolates, which break down into bioactive compounds like isothiocyanates and indoles. These compounds have been linked to reduced cancer risk, particularly for lung and colorectal cancers, in some epidemiological studies. However, evidence for their protective effects against breast and prostate cancer is limited and inconsistent. Genetic variations in metabolism can influence how these compounds affect cancer risk. Isothiocyanates and indoles, such as sulforaphane and indole-3-carbinol (I3C), may have anticarcinogenic properties, but some studies suggest potential harmful effects. Cooking methods can affect the bioavailability of these compounds. I3C and its derivative DIM may alter estrogen metabolism, but their impact on breast cancer risk is unclear. While some preliminary trials suggest I3C may help in treating HPV-related conditions, larger studies are needed. Although many organizations recommend 5–9 servings of fruits and vegetables daily, specific guidelines for cruciferous vegetables are lacking. Further research is needed to understand the mechanisms and individual variability in the effects of cruciferous vegetables on cancer risk.