Let's just call the Superhuman - "X". Let's just say that he's 7 feet tall, advanced musculature, large brain, advanced intellect etc etc - basically, a very advanced member of the human race, above the peak of even the very best human.
Now, it is necessary that we keep him alive (e.g. he's working on an important weapons experiment).
So, with this in mind, how do we use his DNA to enhance a living human. I know we can of course create an enhanced human by simply having "X" procreate; but, how, for example can we use "X's" DNA/genes/blood/bone marrow to enhance/improve a living young boy or a living young man?
Or can we not?