There is a wide variety of nutritional supplements available to consumers today. Some promise more energy, while others promise a large increase in muscle mass. Although the claims sound nice, many are not backed by scientific evidence, or the current research provides mixed results. Another concern is that nutrition supplements do not have to adhere to the strict safety measures that are set in place for food and drugs. Without the same strict regulation, some supplements contain banned or illegal substances because the manufactures are not required to test for quality or purity of their products.
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