Beef from pasture-finished cattle contains significantly higher concentrations of vitamin E, iron, and zinc than beef from grain-fed cattle, and supplementation of grain-fed cattle with grapeseed extract does not significantly alter these micronutrient concentrations.

Cows that eat grass consume plants rich in vitamins, minerals, and fatty acids. These nutrients pass directly into their bloodstream and get stored in muscle tissue. The grass diet also makes the cows more active and boosts their metabolism, which increases the production of certain organic acids in their muscles. Adding small amounts of grapeseed extract to grain-fed cows does not change their muscle nutrient levels because the dose is too low to be absorbed or have any effect.