Table 7.

Summary of studies on the safety of quercetin supplement.

n	Health Status	Dosage (mg)	Duration (weeks)	Adverse Event	Ref.
93	Normotensive and Stage I hypertension	150	6	No effects on liver, kidneys, electrolytes, and hematology biomarkers	[73]
49	Healthy	150	8	Increased TNF-α by 0.11 pg/mL, p < 0.05	[89]
40	Athletes	1000	6	No adverse events reported	[90]
30	Chronic Hepatitis C	250–5000	4	No adverse effects on liver function but mild gastrointestinal discomfort	[91]

Abbreviations: HTN, hypertension; TNF-α, tumor necrosis factor.