Both Varsag pulp stories were credited to Craig Ellis, but that pen name covered a different writer on each one (see the ISFDB; I found the info in the 1952 Day Index.). The first is the only SF story that Lee Rogow had published, as far as I know. The second is by David V. Reed. He used the pen name Coram Nobis for his Plop! scripts like the "Dr. Varsag" refry. (The artist is Lee Marrs.)
The first Varsag experiment in Amazing involved giving someone superspeed with mongoose-based injections. Does that sound as if some comics writer lifted it a lot sooner than 1975?