It depends on the case; there is no single guideline.
Effect by goal · level of evidence
Mortality in type 2 diabetes
associationLow-moderatestudy (A)
Cohort study (2,461 people with type 2 diabetes, NHANES): higher dietary luteolin intake (a flavonoid from vegetables and herbs) was associated with lower total and cardiac mortality. Observational association, causation not proven.
Mortality in type 2 diabetes — association (Low-moderate, study). Cohort study (2,461 people with type 2 diabetes, NHANES): higher dietary intake of luteolin (a flavonoid from vegetables and herbs) was associated with lower all-cause and cardiac mortality. Observational association, causation not proven. 36966325
Information, not medical advice. Prescription drugs require a doctor.
Information, not medical advice. Scientific evidence reflects the quality of the studies.