Supplements as generally understood include vitamins, minerals, fiber, fatty acids, or amino acids, among other substances. U.S. authorities define dietary supplements as foods, while elsewhere they may be classified as drugs or other products. There are more than 50,000 dietary supplements available. More than half of the U.S. adult population (53% - 55%) consume dietary supplements with most common ones being multivitamins.
Wind power capacity has expanded to 369,553 MW by December 2014, and total wind energy production is growing rapidly and has reached around 4% of worldwide electricity usage.
According to the Energy Information Administration, renewable energy will account for about one-third of new electricity generation added to the U.S. grid over the next three years. Wind energy is leading the way with 19,500 MW of installed capacity at mid-year, including more than 1,000 MW added in the last six months.