None, likely, unless Vascepa or Amarin or sufficiently specific depictions of hearts or other like images are specifically included or mentioned in the copycat ad.
But be aware that images, videos or audio sounds are also registered trademarks as a means or device that distinguishes a person’s goods from those of others. The NBC shell design or the roar that a Harley motorcycle makes are registered trademarks. See section 2 and 45(?) of the trademark laws. “Does she, or doesn’t she?” is in my mind as an example.
Copyright registrations also enter the milieu.
News 
Market Data 
Discover 
