The press ad for the pomegranate drink featured the strapline 'Healthy Happy Heart'. It claimed that the juice could improve heart health, minimise the risk of strokes and could help reduce hardening of the arteries, which can cause heart disease or a stroke.
A doctor challenged the claims on the grounds that it made unauthorised medicinal claims for a food product.
Pomegreat defended the claims, saying they were supported by research in 15 journals and were not medicinal. But the ASA ruled that they were medicinal and therefore breached guidelines.
The ruling comes a month ahead of the publication of the EU health claims legislation in January, which will detail what claims advertisers can and can't make.