National Toxicology Program

National Toxicology Program

Nomination Summary for Usnic acid & usnea barbata herb (N20513)

Usnic acid & usnea barbata herb

Specific Substances: Usnic acid

Nomination Date: 01/27/2005

Nominator: FDA

Rationale: Widely used in dietary supplement and personal care products; lack of adequate toxicological data; numerous human adverse event reports

NTP Principles: 5, 6, 8

Status: Selected

Agents and Status

The following information relates to the specific agent and may include history from earlier or later nominations for this same agent.

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CASRN: 125-46-2

Agent Name: Usnic acid

NTP is located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.