Here's Neal Adams' original art that was used for the Super Heroes Chewable Vitamins campaign (currently for sale over on Romitaman). If you look closely, you can see an erased figure right next to Batman, who looks a lot like Aquaman. Based on the final layout of the ad, maybe the Sea King was moved so he wouldn't be so obscured by the harried Mom (who is on her fifth cup of "coffee").
I have never been able to find a bottle of these--open or sealed--on eBay, so I have always been curious as to whether there are little "A" shaped vitamins included. I seem to remember taking these as a kid, but that was so long ago...
(h/t: F.O.A.M.er Ilke Hincer)