What is a major downside of melatonin regulation?

• A. It is not FDA-approved, resulting in a lack of screening for purity or accurate label claims.
• B. It is regulated with strict FDA oversight guaranteeing purity and labeling.
• C. It is only available by prescription.
• D. It is subject to comprehensive scheduled dosage limits.

Answer: (A)

The key idea is that melatonin is regulated as a dietary supplement rather than a drug. Because of this, it doesn’t undergo premarket FDA approval or rigorous screening for purity and accurate labeling before it reaches consumers. That creates variability among products: some bottles may contain the labeled amount, others may have more or less, and there can be contaminants or misleading ingredient lists. The FDA can take action if problems are found, but there isn’t nationwide premarket assurance of safety, efficacy, or consistency the way there is with prescription or over-the-counter drugs.

In contrast, the other statements don’t fit: melatonin is not limited to prescription use and is commonly sold OTC in many places, there aren’t federal scheduled dosage limits for dietary supplements, and the reality is not strict FDA oversight guaranteeing purity and labeling.