Library.

“Under the Dietary Supplement Health and Education Act of 1994, the U.S. Food and Drug Administration is prohibited from reviewing dietary supplements for safety or efficacy before they are marketed.”

DSHEA does not require FDA premarket approval for most dietary supplements, and products need not be proven safe or effective before sale. However, the claim that FDA is "prohibited from reviewing" supplements before marketing overstates the law. DSHEA requires a 75-day premarket notification for New Dietary Ingredients, during which FDA receives and may review safety information. The accurate framing is that FDA lacks mandatory premarket approval authority — not that it is categorically barred from any premarket review.

“Collagen supplements in the United States are largely unregulated by the Food and Drug Administration due to the Dietary Supplement Health and Education Act of 1994.”

The claim is substantially accurate. DSHEA (1994) does exempt collagen supplements from FDA premarket approval and shifts the burden of proving unsafety to the FDA, which multiple peer-reviewed and medical sources confirm. However, "largely unregulated" overstates the situation: the FDA retains meaningful post-market authority including cGMP manufacturing standards, labeling enforcement, adulteration removal powers, and premarket safety review for new dietary ingredients. A more precise framing would be "largely exempt from premarket approval requirements" rather than "largely unregulated."