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(HealthDay News) — Testosterone supplements have long been marketed to aging men as a fountain of youth and virility, but there is still no proof they are safe or effective, according to the U.S. Food and Drug Administration.

Writing in the Aug. 20 edition of the New England Journal of Medicine, FDA officials said that only controlled clinical trials can show whether men benefit from treatment to reverse age-related dips in testosterone.

The agency is now requiring product manufacturers to conduct those trials.

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