Vitamin company Blackmores has been publicly shamed on China's annual Consumer Rights Day for violating the Chinese government's strict "truth in advertising" laws.

Blackmores was fined approximately $69,000 for claiming online and in stores that it was Australia's top nutritional supplement brand, and that its vitamins could treat cardiovascular disease and assist the treatment of arthritis.

The Blackmores fine was revealed in state media reports, timed for China's Consumer Rights Day, which listed 11 companies found guilty of violating the advertising law

Lawyers observed that four of the 11 were fined for using superlative words, and Blackmores' problem was claiming to be Australia's number one.