Polyphenols

Polyphenols are a diverse class of naturally occurring bioactive compounds found in plants, categorized into four main groups: flavonoids (e.g., quercetin, catechins), phenolic acids, stilbenes (e.g., resveratrol), and lignans. They act as secondary metabolites that protect plants from environmental stressors like UV radiation and pathogens. In human nutrition, they are considered non-essential but highly beneficial micronutrients that contribute to the prevention of chronic diseases and the promotion of healthy aging.

Polyphenols function through a multi-targeted approach. While historically known as direct antioxidants, current research highlights their role in xenohormesis, where they trigger beneficial stress responses in human cells. They activate the Nrf2 pathway to upregulate endogenous antioxidant enzymes, stimulate SIRT1 for longevity and DNA repair, and modulate the NF-κB pathway to reduce systemic inflammation. Additionally, they improve endothelial function by increasing nitric oxide bioavailability and act as prebiotics by feeding beneficial gut bacteria, which in turn metabolize them into more bioavailable active metabolites like urolithins.

• Prioritize Bioavailability: Use standardized extracts like 'phytosomal' or 'liposomal' forms for compounds with low absorption, such as curcumin or resveratrol
• Dosage Guidelines: Clinical evidence suggests beneficial ranges of 300–600mg per day for mixed extracts, though specific compounds like curcumin are often effective at 200–500mg
• Strategic Timing: Take fat-soluble polyphenols with a meal containing healthy fats to enhance uptake
• Dietary Foundation: Supplements should complement a 'Rainbow Diet' rich in berries, cocoa, green tea, and extra virgin olive oil for synergistic effects
• Caution with Fasting: Avoid taking high-dose concentrated extracts (e.g., green tea EGCG) on an empty stomach to prevent potential liver strain.