รีวิว Duracore: While both studies seemed to show positive results, they are rendered virtually useless because neither study used a control group that was administered placebo for a valid comparison. Duracore Lack of evidence about the safety and efficacy of dietary supplements exposes the consumer to unknown health hazards, as these products use ingredients that are of unknown therapeutic benefit. Marketers of these supplements have been known to engage in fraudulent and deceptive practices. Marketing hype and high profits should never override the pharmacist's professional responsibility to demand proof of safety and efficacy in the products we recommend.