There was a time when The Flintstones weren't the only cartoon characters to be featured as chewable vitamins.
In 1985, Miles Laboratories (now Bayer) added Bugs Bunny to their line of licensed properties. Unfortunately, Bugs Bunny vitamins didn't sell as well, and are long out of circulation. I know, hard to believe, right? Bugs, who'd been used to sell cereal and breakfast drinks for General Foods in the 60's, and did PSAs earlier in the 80's (which we'll do another time), should've been an easy sell.
Check out this introductory ad from 30 years ago, with Mel Blanc as Bugs.
Maybe if they marketed Looney Tunes vitamins, it'd probably do better, but do kids really want to chew on Elmer Fudd?