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<h3>Overview</h3><p>Caffeic acid (CAS <strong>331-39-5</strong>, C<sub>9</sub>H<sub>8</sub>O<sub>4</sub>) is a ubiquitous phenolic compound synthesized via the shikimate pathway. It serves as a key intermediate in lignin biosynthesis and functions as a potent antioxidant in industrial extraction processes.</p><h3>Application</h3><ul><li>Pharmaceuticals: Antioxidant excipient for drug stability.</li><li>Food Industry: Natural preservative in lipid-based formulations.</li><li>Cosmetics: Active ingredient in UV protection serums.</li></ul><h3>Precautions</h3><p>Maintain storage below 25°C in dry, inert atmosphere. Avoid inhalation of dust; use appropriate PPE during handling to prevent dermal irritation.</p>