7 The Super solider serum.

The Serum didn't change any DNA structure but improved the physiology of the user and later it is fused with the subject DNA.

A wich or Wizard is already a supersoldier as in an average quidditch match the rider feels more than 10g of force in various manoeuvres. A highly trained wizard in martial arts can overpower most of his opponents. The Knight of the High Table during King Aurther reign was no less than Captain America as magic makes a qualitative improvement in a wizard's body.

Harry was studying the notes of the serum and he couldn't understand a shit. It is not his fault even during his hospital stay he completed his education and college in bed at the age of 16 but still, this biology was too complex as it had various decay rate equations which was surely not possible in his previous life. 

There were even more radioactive elements and new radioactive decay reactions like vita rays decay and such.

The serum made by Howard Stark was almost perfect as it surely improved the body and it mutates the muscles to not gain mass but strengthen themselves without increasing the muscle mass massively. The serum can fused with the recipient's DNA and then make it evolve with the right time and simulation. Howard's notes said the serum can make the user stronger than Captain America. 

Captain America had a strength of just 360 kg post serum but soon it was raised to 500kg due to training. Buckey Barns had a Hydra version of SSS and his strength was much stronger than Captain America around 800kg at peak. even though Captian had much greater reflexes.

A well-trained wizard can lift around 300kg with his strength. Harry didn't know how Howard's serum would affect him as it is said that serum makes good better but bad worse. Harry knows that he didn't have any major physiological issues like the Hydra agents so we will not be affected by the serum and he can use occulumency to preserve his mind. It was said that the Hydra agents were much stronger than Bucky and Harry wanted that power.

As Harry spends his summer at Black Townhouse he can make some adjustments as he uses a lot of ward stones and during the process of taking the serum, he would make them pour his stored magic back into his body even though Howard's serum doesn't require energy.

Harry then bit the bullet as he stored days' worth of magic in his setup. Harry then injected himself with serum as the serum was completely injected. Harry found himself in a sea of pain as his body was sucking all the magic and improving his body at the cellular level. He could feel his magic going out of control as the room was devastated the process lasted for hours and Harry fell unconscious during the process.

As the Bright sun shined in his room Harry made his way to the world of living he opened his eyes he soon found that he was enhanced much more than he expected as the whole bathroom door came out of hinges. Soon with his newly acquired perfect body control from his new physique, he was able to control his strength.

Harry then went outside as he started running he could see that he was running at least at Olympic level without even trying soon he made it to an abandoned warehouse.

He found that he could easily lift a completed forklift which weighed around 5 tons without breaking a sweat. He knew that he was now at least a class 5 hero and his strength would grow with age. Harry then went back to his house and started to make some weight enchanted to weigh more than they should, to exercise and improve his strength.

If Harry had to say he believes that his body is now closer to an average Asgardian than a human in strength. Now he has to learn martial arts and improve his knowledge of science.

Harry was spending his days in exercising and studying magic as he found both his magical core and his brain improved by a factor of 10 it was like he was living with his eyes closed throughout his life.

Now Harry found the feeling of a genius as he could learn things within days which would take people years Harry set to complete his Hogwarts curriculum this summer itself as he could make plans to gain access to the Library of Ravenclaw. 

Harry was in his library when he heard someone looking at him as he turned he found someone at the far end of the library. Harry was afraid as who was able to breach the wards of the black family without making a noise is not the one he could handle.

As Harry was about to run, He heard a feminine voice say" Follow me, Mr. Potter we have much to discuss about your actions with the super soldier serum."

Soon there were golden sparks and a portal was formed which ......