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POSSIBLY EFFECTIVE

• Colorectal cancer. Consumption of cruciferous vegetables, including broccoli, seems to reduce the risk of developing colorectal cancer. Details: Epidemiological research suggests that the highest intakes of cruciferous vegetables, including broccoli, are associated with an 18% to 20% reduced risk of developing colorectal neoplasms when compared with the lowest intakes (14148,96187,96189).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Bladder cancer. It is unclear if consumption of broccoli reduces the risk of developing bladder cancer. Details: Epidemiological research suggests that eating about 1.75 cups daily of cruciferous vegetables, such as broccoli or cabbage, is associated with a 30% reduced risk of developing bladder cancer (14864).
• Breast cancer. It is unclear if consumption of broccoli reduces the risk of developing breast cancer. Details: Epidemiological research suggests that consumption of broccoli is associated with a modestly reduced risk of developing breast cancer in premenopausal adults. However, broccoli consumption does not seem to be associated with breast cancer risk in postmenopausal adults (14146).
• Fibromyalgia. Broccoli has only been evaluated in combination with ascorbigen; its effect when used alone is unclear. Details: A small clinical study in females with fibromyalgia shows that taking one capsule containing ascorbigen 100 mg and broccoli powder 400 mg once daily for one month improves pain by 18% and reduces physical impairment by 20% when compared to baseline (19605). It is unclear if this effect is due to broccoli, ascorbigen, or the combination. The validity of these findings is limited by the lack of a comparator group.
• Gastric cancer. It is unclear if consumption of broccoli reduces the risk of developing gastric cancer. Details: A small epidemiological study suggests that higher consumption of broccoli is associated with a reduced risk of developing gastric cancer when compared with lower consumption (14148).
• Helicobacter pylori. It is unclear if consumption of broccoli is beneficial for treating Helicobacter pylori infection. Details: A moderate-sized clinical study in adults with Helicobacter pylori infection shows that taking broccoli seed extract 200 mg, containing 16% glucosinolates, daily before bedtime for 2 months does not improve Helicobacter pylori eradication rate when compared with placebo (112445,112446).
• Hypercholesterolemia. Broccoli has only been evaluated in combination with cabbage; its effect when used alone is unclear. Details: A small clinical study in patients with mild to moderate hypercholesterolemia shows that consuming 160 grams of a beverage containing broccoli, cabbage, and fruit twice daily for 12 weeks reduces levels of low-density lipoprotein (LDL) cholesterol by 8.5% when compared to baseline. It is unclear if the improvement from baseline differed when compared with those consuming a similar beverage without broccoli and cabbage (19607). It is unclear if this effect is due to broccoli, other ingredients, or the combination.
• Hypertension. It is unclear if consumption of broccoli can prevent hypertension in healthy adults. Details: A meta-analysis of 3 prospective cohort studies in healthy adults suggests that eating 100 grams of broccoli daily is associated with a 12% reduced risk of hypertension. However, 2 other studies in the meta-analysis suggest that broccoli, consumed as part of a larger group of cruciferous vegetables, is associated with an 11% increased risk of hypertension per 100 grams eaten daily (112087).
• Prostate cancer. It is unclear if consumption of broccoli reduces the risk of developing prostate cancer; the available research is conflicting. In patients with prostate cancer, broccoli has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Some epidemiological research suggests that consumption of Brassica vegetables, such as broccoli, Brussels sprouts, cauliflower, and cabbage, is associated with a reduced risk of developing prostate cancer (14145). However, other epidemiological research has found no association (14147,15172). Clinical research in adults with prostate cancer shows that taking a whole food formulation containing broccoli powder 100 mg, turmeric powder 100 mg, pomegranate whole fruit powder 100 mg, and green tea extract 20 mg three times daily for 6 months prevents an increase in prostate specific antigen (PSA) levels. Mean PSA levels increased by 15% in the whole food formulation group, compared with 79% in the placebo group. Also, 46% of those taking the whole food formulation showed final PSA levels that were the same or lower than initial PSA levels, compared with 14% of those in the placebo group (89730). However, it is not yet known whether the whole food formulation reduces the risk of prostate cancer progression or recurrence. It is unclear if these effects are due to broccoli, other ingredients, or the combination. More evidence is needed to rate broccoli for these uses.

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LIKELY SAFE ...when used orally in food amounts (14145). There is insufficient reliable information available about the safety of broccoli when used in medicinal amounts.

PREGNANCY AND LACTATION: LIKELY SAFE
when used orally in food amounts (14145). There is insufficient reliable information available about the safety of broccoli when used in medicinal amounts during pregnancy and lactation; avoid using.

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CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, broccoli might reduce the levels and effects of drugs metabolized by CYP1A2.  Details Pharmacokinetic research in humans shows that eating 500 grams of fresh broccoli daily for 6-12 days can increase CYP1A2 activity by 10% to 200% (19608,95722). Induction of CYP1A2 activity by broccoli is attributed to its glucosinolate constituents (19608).

CYTOCHROME P450 2A6 (CYP2A6) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, broccoli might reduce the levels and effects of drugs metabolized by CYP2A6.  Details Pharmacokinetic research in humans shows that eating 500 grams of broccoli daily for 6 days increases CYP2A6 activity by 135% to 550%. Induction of CYP2A6 activity is attributed to its glucosinolate constituents (19608).

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General ...Broccoli is well tolerated when consumed as food. A thorough evaluation of safety outcomes when broccoli is taken as medicine has not been conducted.

Dermatologic ...Topically, allergic reactions to broccoli have caused contact dermatitis (14158).

Gastrointestinal ...Orally, loose stools, diarrhea, abdominal pain, and abdominal cramping have been reported following intake of broccoli seed and sprout extracts, particularly at high doses (114753).

Hepatic ...In one case report, a 56-year-old adult developed elevated transaminases, with alanine aminotransferase (ALT) 5. 8 times above normal, aspartate aminotransferase (AST) 2.4 times above normal, and gamma-glutamyl transpeptidase (GGT) 5.1 times above normal. This was thought to be related to the consumption of 800 mL of broccoli juice daily over a 4-week period. Values returned to normal 15 days after cessation of juice consumption (96191).

Immunologic ...Topically, allergic reactions to broccoli have caused contact dermatitis (14158).

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