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Organic milk and dairy products may contain higher levels of omega-3 fatty acids and slightly higher amounts of iron, vitamin E, and some carotenoids. , organic milk may contain less selenium and iodine than non-organic milk. These are two minerals that are essential for health. A review of 67 studies found that organic meat contained higher levels of omega-3 fatty acids and slightly lower levels of saturated fats than conventional meat. A higher intake of omega-3 fatty acids has been with many health benefits, including a reduced risk of heart disease. However, several other studies found no differences. While several studies find that organic foods can have significant positive outcomes, others have found insufficient evidence to recommend organic over conventional. An observational study comparing the nutrient intakes of nearly 4,000 adults consuming either organic or conventional vegetables found results. Although a slightly higher intake of certain nutrients was seen in the organic group, this was most likely higher overall vegetable consumption.