Final answer:
Research has shown that prohormone dietary supplements do not effectively increase muscle mass or strength.
Step-by-step explanation:
The statement that research has shown that prohormone dietary supplements marketed as anabolic agents, such as androstenedione, do not effectively increase muscle mass or strength is true.
Prohormones are precursors to hormones and are typically sold as a precursor to testosterone. However, studies have shown that these supplements have not been thoroughly studied, and their health effects are unknown. Additionally, the harmful effects of using anabolic steroids, which are synthetic equivalents of testosterone, outweigh their benefits.
Therefore, it is not recommended to rely on prohormone dietary supplements for increasing muscle mass or strength.