GS1 barcodes for supplements: how to set them up

Getting your numbers

• Join GS1 UK. You get a company prefix and can create your own GTINs (Global Trade Item Numbers), usually 13-digit EAN-13 codes for retail packs.
• Avoid cheap resold barcodes. Retailers and Amazon check that the number is registered to your brand, and resold numbers often fail.
• Record the product details for each GTIN in your GS1 account.

One product, one GTIN

Each distinct pack needs its own GTIN: different flavours, strengths, pack sizes or counts each get one. A change that customers or retailers would treat as a different product, such as a new net quantity, generally needs a new GTIN. Follow the GS1 GTIN management rules.

Printing barcodes that scan

• Print the EAN-13 at 80% to 200% of its nominal size (about 37 × 26 mm at 100%). Don't shorten the bar height.
• Keep the quiet zones clear: blank space on both sides of the bars.
• Use dark bars on a light background. Black on white is safest. Red bars don't scan.
• On small curved tubs and bottles, turn the barcode so the bars run around the curve rather than across it.
• Avoid seams, folds, gussets and the overlap on wrap-around labels.

Barcode placement on the proof

We check that the barcode appears on the proof and flag placement that is likely to cause problems, such as a fold or seal running through it.