Antioxidant additive for incorporation into a food, food complement or food supplement for animal, preferably a ruminant, comprises a herbal extract comprising extracts of artichoke, rosemary, tagete, turmeric extract, extract of citrus fruits, preferably grapefruit, nettle, garlic, grape, milk-thistle, andrographis, green tea and tomato. Antioxidant additive for incorporation into a food, food complement or food supplement for animal, preferably a ruminant, comprises a herbal extract comprising extracts of artichoke ( Cynara scolymus L.), rosemary ( Rosmarinus officinalis L.), tagete ( Tagetes spp. ( T. minuta, T. erecta)), turmeric extract, ( Curcuma longa L), extract of citrus fruits ( Citrus), preferably grapefruit, nettle ( Urtica dioica), garlic ( Allium sativum), grape ( Vinis vitifera), milk-thistle ( Silybum marianum (L.) Asteraceae), andrographis ( Andrographis paniculata), green tea ( Camellia sinensis, Camellia thea Link./ Thea sinensis L.), and tomato ( Solanum lycopersicum L., Lycopersicum esculentum Mill). An independent claim is included for a complete food, food complement and nutritional supplement incorporating the additive.