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Antioxidants and Oxidative Stress

Vitamin C as Antioxidant

Vitamin C is a water-soluble antioxidant that protects cells and regenerates vitamin E.

Definition

A water-soluble vitamin that neutralizes free radicals in aqueous environments and regenerates oxidized vitamin E. Also supports enzymatic antioxidant synthesis.

How it works

Vitamin C (ascorbic acid) operates as a primary antioxidant in aqueous cellular environments, directly scavenging free radicals and reactive oxygen species. Importantly, it regenerates oxidized vitamin E, restoring its antioxidant capacity in a cooperative interaction essential for comprehensive protection. Vitamin C also serves as a cofactor for hydroxylation enzymes involved in collagen synthesis, immune function, and micronutrient absorption. Since humans cannot synthesize vitamin C, consistent dietary intake from fruits and vegetables is essential.

Role

Neutralizes water-soluble free radicals and regenerates other antioxidants.

Examples

  • Orange and citrus fruits
  • Kiwi and berries
  • Bell peppers
  • Broccoli and kale
  • Tomatoes

Recommendations

Consume 75-90mg daily from fresh fruits and vegetables. Eat vitamin C-rich foods with vitamin E sources to enhance synergy. Prioritize fresh produce as vitamin C degrades with storage and cooking.

Key takeaway

Regular vitamin C intake from whole foods is essential for cellular defense.

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