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Guides and tutorials

Polyphenols as a dietary supplement: how to make the right choice?

28/10/2026

Resveratrol, quercetin, EGCG… Polyphenols comprise thousands of molecules with very different properties. To choose a polyphenol as a dietary supplement, you need to consider its family, formulation and bioavailability.

📌︎ Key points
  • ✓Polyphenols are plant compounds found mostly in fruit, vegetables, tea, coffee, cocoa, spices and certain seeds.
  • ✓They are primarily studied for their interactions with oxidative stress and associated cellular mechanisms.
  • ✓Certain polyphenols, such as resveratrol, quercetin and EGCG, are available as dietary supplements.
  • ✓A standardised extract provides a defined quantity of active ingredients, whilst certain micellar or liposomal formulations can improve the bioavailability of poorly soluble molecules.
  • ✓Dietary supplements rich in polyphenols are no substitute for a varied diet and should be chosen based on their composition, dosage and precautions for use.

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Guides and tutorials

Vitamin K1 (phylloquinone): benefits, dietary sources and requirements

Vitamin K1 is best known for its role in blood clotting, but it also helps maintain healthy bones. Discover the benefits of vitamin K1, the foods richest in it and the recommended daily intakes.

✦ Key takeaways Key points from this article
  • ✓Vitamin K1 (phylloquinone) is the main form of vitamin K obtained from food.
  • ✓It contributes to normal blood clotting and the maintenance of normal bones.
  • ✓Green leafy vegetables are the best sources of vitamin K1.
  • ✓Its absorption is enhanced when consumed with a small amount of fat.
  • ✓People being treated with an anti-vitamin K anticoagulant must maintain a regular intake of vitamin K and should not alter this without medical advice.

11/09/2026
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