What the term denotes
Vitamins are organic compounds required in small amounts by an organism that cannot synthesise them in sufficient quantity. Enzymes are proteins that catalyse biochemical reactions. Grouped together here as a catalog heading, the two are chemically distinct and the heading is an organisational convenience rather than a statement that they are alike.
Two different things under one heading
Vitamins and enzymes are separate chemical categories. Their appearance under a single heading reflects how the supplier organises a list, not a shared property.
Research use only
Everything grouped under this heading in our catalog is designated research use only. That designation marks material as intended for laboratory research and explicitly not for diagnostic or therapeutic use. It describes intended use — it is not a statement about quality, and it does not create a category of permitted use in people.
Where authoritative reference material lives
The NIH Office of Dietary Supplements publishes fact sheets on individual vitamins and minerals, written for both professionals and the public. Those are reference material about the nutrient itself and say nothing about any product in any catalog.
Documentation to expect
A certificate of analysis naming the lot, stated composition and concentration, and storage conditions. For anything with a stated potency, the method behind that figure is part of the evidence.
Authoritative sources
US government publications, linked for reference. None of these evaluate, approve or endorse anything in this catalog.
- NIH Office of Dietary Supplements ↗
NIH fact sheets on vitamins and minerals, written for both professionals and the public.
- FDA — Dietary Supplements ↗
How FDA regulates dietary supplements, which is a separate framework from both drugs and research materials.
- NIH PubChem ↗
National Library of Medicine chemical database. Structure, identifiers and published literature for a named compound.
- 21 CFR Part 809 (eCFR) ↗
The federal regulation containing the research-use-only labelling provision for in vitro diagnostic products.
- FTC — Health Products Compliance Guidance ↗
What the Federal Trade Commission expects of anyone making a health-related claim in advertising.
Frequently asked questions
- What is a vitamin?
- An organic compound an organism requires in small amounts and cannot synthesise in sufficient quantity itself. NIH publishes fact sheets on individual vitamins and minerals.
- What is an enzyme?
- A protein that catalyses a biochemical reaction. Enzymes and vitamins are chemically distinct groups that appear under one catalog heading for organisational reasons.
- Does research use only apply to vitamins too?
- Where an item is designated research use only, yes — the designation attaches to the material as supplied, independent of what chemical class it belongs to.
- Where can I read reliable information about a specific vitamin?
- The NIH Office of Dietary Supplements publishes fact sheets covering what is known about individual vitamins and minerals. Those describe the nutrient, not any commercial product.