Can a shop sell supplements without showing the ingredients?

No. Every dietary supplement legally sold in the US must display a complete ingredient list and a "Supplement Facts" panel — this is one of the most basic, non-negotiable requirements under the Dietary Supplement Health and Education Act (DSHEA) and FDA labeling regulations. A seller with no ingredient information at all isn't using a loophole; it's selling a misbranded product.

What must be on the label

DSHEA and FDA rules require every dietary supplement label to include:

• A statement identifying it as a "dietary supplement" (or a variant naming the specific ingredient, e.g. "ginseng supplement")
• The net quantity of contents (e.g. "60 capsules")
• A Supplement Facts panel listing serving size, servings per container, each dietary ingredient, the amount per serving, and percent Daily Value where one is established
• An "other ingredients" statement for anything not on the Supplement Facts panel itself — fillers, binders, colors, capsule material
• The name and place of business of the manufacturer, packer, or distributor

Ingredients that aren't listed anywhere on the label are a compliance failure regardless of how the product is marketed or sold.

The one real exception — proprietary blends

This is the only significant gap in federal disclosure rules, and it exists to let companies protect a formula from being reverse-engineered by competitors. It's narrower than people often assume: a company still has to name every ingredient — it just doesn't have to say how much of each is inside the blend.

Why this matters beyond curiosity

• Allergen and interaction risk — if you can't see an ingredient, you can't check it against a medication or allergy
• Dosage transparency — inside a proprietary blend, one ingredient could theoretically make up almost all of the blend's weight while another barely registers, and you'd have no way to know
• Truth-in-advertising overlap — if a company advertises a specific ingredient's benefit ("clinically studied dose of X") without disclosing whether that dose is actually in the blend, that's a separate FTC substantiation issue on top of the labeling gap

What to do if a product shows no ingredients at all

1. Check the physical label and every product photo on the listing — sometimes the ingredient panel exists but simply isn't photographed for the online listing.
2. If it's genuinely missing everywhere, contact the seller directly and ask for the full Supplement Facts panel before purchasing.
3. If a seller can't or won't provide it, don't buy the product — there's no way to verify what you'd be taking.
4. Report the listing to the platform it's sold on (Amazon, a marketplace, or the retailer's own site) and, if it's a pattern from one seller, to the FDA.

Related questions

• Can a supplement be sold as "natural" if it contains synthetic ingredients?
• Can a supplement company claim its product can treat a disease?
• Can an online seller refuse a refund because I opened the supplement?

Official sources

• FDA — Dietary Supplement Labeling Guide
• FDA — Dietary Supplements overview