From the FDA site:
Among the substances found in products that are marketed as dietary supplements and that contain hidden or deceptively labeled ingredients are
- the active ingredients in FDA-approved drugs or their analogs (closely-related drugs).
- other compounds, such as novel synthetic steroids, that do not qualify as dietary ingredients.
FDA has also alerted consumers to hundreds of products with these often deceptively labeled and harmful ingredients, including more than 80 products marketed for sexual enhancement, more than 70 products marketed for weight loss, and more than 80 products marketed for bodybuilding.
Interesting: We've been working on cases involving unsafe supplements for several years, and to me the problem is getting worse, not better. Let's see how the FDA moves on this.