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The most common types of ingested birth control contain estrogen. But the hormone doesn’t just prevent human babies.

Weight-loss products containing the hormone HCG are illegal and potentially dangerous, the Food and Drug Administration (FDA) said today, and consumers are advised to steer clear of the oral drops, pellets and sprays that can be found online and in retail stores.

For men hunting for a partner, testosterone’s a good thing. It boosts competitive behavior, and increases men's attractiveness to women.

When your stomach’s empty, it pumps out the hormone ghrelin, to whet your appetite and get your juices flowing. But ghrelin doesn’t just make you crave a bite. It helps you track it down too--by sharpening your sense of smell.