How to substantiate an environmental claim under EU law

Published 9 July 2026 · Directive (EU) 2024/825 · General information, not legal advice

Short answer

Under the EU rules that apply from 27 September 2026, a green claim survives if it is specific, true, evidenced and the evidence is accessible to the consumer — and if it isn’t one of the practices banned outright. Directive (EU) 2024/825 tightens the Unfair Commercial Practices Directive so that vague or unproven environmental claims are misleading. The working test: name the exact benefit, prove it, show where a shopper can check, and put the qualification on the same medium as the claim.

This is general information to help you screen your own copy — not legal advice. A flag here is a well-founded warning, not a ruling. Only the Court of Justice of the European Union (CJEU) can interpret the directive with binding force, and the European Commission’s guidance on it is non-binding. Where money or reputation is at stake, take the cited provision to qualified counsel before you act.

First: is the claim banned outright, or just to-be-proven?

Substantiation only helps for claims you’re allowed to make. Some practices are banned in all circumstances under Annex I of the UCPD — no amount of evidence rescues them:

banned Offset-based neutrality claims (“carbon neutral” via credits) — Annex I 4c.
banned Generic claims (“eco-friendly”) without recognised excellent-performance certification — Annex I 4a.
banned Self-made / uncertified sustainability labels — Annex I 2a.

For everything else — specific claims and properly-backed future targets — substantiation is what makes them lawful.

The evidence bar

Pulled together from the directive and the Commission’s guidance, a substantiated environmental claim should be:

Specific. Name the exact attribute, scope and magnitude — “80% post-consumer recycled aluminium”, not “made sustainably”.
True and not misleading in context. It must hold as the average consumer would read it, including any implied meaning.
Scoped honestly. Don’t claim for the whole product what’s true of one part — that’s the partial-claim ban (Annex I 4b).
Evidenced. You hold data, testing or certification that supports it.
Accessible. The consumer can find the substantiation, and the qualifying detail sits on the same medium as the claim — not buried where they can’t see it.
Current. The evidence is up to date; environmental data and certifications expire.

A practical substantiation checklist

Write the claim as a specific fact. Replace virtue words with the measurable benefit.
State the scope. What exactly does it cover — the product, the packaging, one component?
Attach the proof. Standard, test, certification, or dataset. Name the standard where one applies (e.g. “EN 13432” for industrial compostability).
Make it reachable. Put the qualification on the label/page and give the consumer a route to the underlying evidence.
Check the medium. A specific claim whose specification isn’t given clearly on the same medium can slip into being a “generic” claim — and generic claims are banned unless certified.
For future targets, add the plan. A dated, independently-verified implementation plan (see the future-claims guide).
Diarise a re-check. Re-verify before each relaunch and periodically after; law-dependent and data-dependent claims decay.

Imagery counts too

The Commission’s guidance is clear that visuals — a leaf motif, a green colourway, a brand or product name — can themselves be environmental claims. Substantiation isn’t only about your sentences; check your labels, logos and design too.

Frequently asked questions

What does "substantiate" mean under the EU rules?

It means the claim is specific, true, evidenced and the evidence is accessible to the consumer, with the qualifying detail on the same medium as the claim. Vague or unproven environmental claims are treated as misleading actions under Article 6 of the UCPD as amended by Directive (EU) 2024/825.

Can substantiation save a banned claim like "carbon neutral"?

No. Practices on the Annex I banned list — offset-based neutrality claims, uncertified generic claims, self-made labels — are unfair in all circumstances. Substantiation only makes lawful the specific and future claims you are otherwise permitted to make.

Where does the evidence have to be?

Accessible to the consumer. The qualifying specification should appear clearly on the same medium as the claim, and the consumer should have a route to the underlying substantiation. Evidence a shopper cannot reach does not satisfy the duty.

Do images and brand names need substantiating too?

Per the Commission guidance, yes — a leaf motif, green palette, or a brand or product name can itself be an environmental claim. Substantiation applies to the message a consumer takes from your design, not only your written sentences.