What certification does not tell you

A certification logo is reassuring precisely because it implies rigour, and that is exactly why it is worth being precise about what each scheme's rigour actually covers — and where it stops.

No single scheme covers everything

GOTS certifies organic fibre content and processing criteria; it does not run a substance-by-substance safety test on the finished item. OEKO-TEX STANDARD 100 runs that safety test; it says nothing about organic content or labour conditions. bluesign assesses chemical inputs, resource use and worker health at a facility level; it is not a per-product organic or recycled-content claim. ZDHC MRSL conformance confirms the chemical formulations used by an input supplier meet a restricted-substances list at the point of manufacture — it certifies the chemistry going into the process, not a test of the finished garment, which is why we cap it at a lower evidence tier than a scheme that certifies the final product.

A certification is a claim about a process, not a promise about your skin

Even the strongest certification stack — organic content verified, processing chemistry restricted, finished article substance-tested — is still a set of process and testing claims. None of these schemes are medical evidence, and none of them predict how any individual person's skin will react to a garment. We do not translate certification into a safety promise, and any product description that does is overstating what the underlying document supports.

Certifications expire and get renewed

Nearly every scheme with real teeth tracks certificate expiry and requires renewal audits. A certificate that was valid two years ago is not automatically valid today. Where a scheme tracks expiry, we track it too, and a lapsed certificate is treated as declared rather than verified until it is renewed.

What certification cannot fix retroactively

A certification applies going forward from the date it takes effect. It says nothing about batches produced before certification, and a brand's certified line does not automatically mean every product in its catalogue is covered — certification is typically scoped to specific facilities, specific product lines, or specific supply-chain segments, not a brand's entire operation.

What to look for

• Which specific scheme is named, and what that scheme's scope actually is.
• An expiry date, where the scheme tracks one.
• Whether the certificate covers the specific product you are looking at, or a different line from the same brand.