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Feed, supplement or drug

On this page8
A claim to treat or prevent disease makes it a drug, and for animals that brings a prescribing veterinarian into it.

The familiar line

A product intended to provide nutrition is food. A product intended to treat, prevent or mitigate disease, or to affect the structure or function of the body, is a drug. Animals do not change that logic.

Where it bites in this category

Supplements. A mineral block is feed. The same block sold as preventing a deficiency disease is making a drug claim, and the line is in the sentence rather than in the mineral.

And it bites hardest in apiary

Treatments for colony pests and diseases are the products a beekeeper most wants, and several of them are veterinary drugs requiring a veterinary feed directive or a prescription. Feeding sugar is food; treating a colony is not.

Which is why this property covers feed and not treatment

Bee feed is in scope. Varroa treatment is not, because it is a different regulatory regime with a veterinarian in it, and pretending otherwise would be the kind of blurring this library tries to avoid.

Medicated feed is its own regime again

A feed containing an approved animal drug is a medicated feed with its own manufacturing and labeling requirements. Adding something active to a supplement is not a formulation tweak.

Topicals sit closer to the line than they look

An animal health topical is in this property because of its container, a small bottle dosed by drop. Whether a given topical is a cosmetic-like grooming product, a pesticide or a veterinary drug depends entirely on what it claims to do.

Decide it in writing, early

With the date and the reasoning. A reformulation or a new claim reopens it, and a decision nobody wrote down gets quietly reversed by whoever writes the next product page.

References

21 CFR 501.4, animal food ingredient declaration. Ingredients "shall be listed by common or usual name in descending order of predominance by weight", with specific rather than generic names and limited exceptions; 501.110 permits certain collective names in livestock and poultry feeds. law.cornell.edu
21 CFR 589.2000, the ruminant feed ban. Protein derived from mammalian tissues is prohibited in ruminant feed, with exceptions including blood products, gelatin, tallow, milk products and porcine or equine protein. Material containing prohibited protein is labeled "Do not feed to cattle or other ruminants". A facility handling both mammalian and non-mammalian protein maintains separate equipment or uses "clean-out procedures or other means adequate to prevent carry-over", with written procedures from receipt through shipment and records kept for at least one year. law.cornell.edu
Written from 21 CFR 501.4, 507.5 and 589.2000, and from the catalog as it stood on 18 October 2026. Commercial feed is also registered and labeled under state law, which this property points at rather than covers; whether a given product is a feed, a supplement or a drug is a determination with consequences, and a medicated feed is a different regime again.