Premixed vitamin preparations — including multi-vitamin blends, provitamin combinations, and natural concentrates containing multiple vitamin fractions — are classified here rather than under the individual vitamin headings, making the mixture composition the decisive classification criterion. These intermixtures are widely used as premix inputs for animal feed, infant formula, and dietary supplement manufacturing, where consistent potency and stability across multiple active ingredients are critical quality parameters. FDA oversight applies to human-use grades, and USDA may have jurisdiction over feed-grade premixes depending on the intended animal species. Because potency and blend ratios vary widely, importers should ensure that certificates of analysis accompany each shipment and that the declared composition matches the entry documentation.

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