Table 2.

Inclusion and exclusion criteria.

Inclusion Criteria	Exclusion Criteria
Studies that are randomized controlled trials	Studies including participants at risk of PAD, including otherwise healthy smokers and hypertensive or diabetic patients
Studies with a sample size ≤ 10 participants	Studies that administer mixed nutrient supplementation where no group receives any specific antioxidant supplement alone
Studies including participants who either are healthy or have established PAD	Studies incorporating dual treatments such as exercise and supplementation
Studies that orally administer a single antioxidant intervention through supplementation or dietary or drug interventions	studies on animal models