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.
The worldâs most used renewable power sources. Renewable energy sources are projected to account for more than one quarter of global electricity production by 2020. Power-technology.com profiles the top five renewable energy sources based on global installed power generation capacities as of 2013. Hydropower.