Isaiah Bradley. They don't talk about you enough.

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Isaiah Bradley. They don't talk about you enough.
I will ask! Do you have any headcanons about Steve's serum? What it did to him, how he dealt with it, unexpected results, good or annoying things about it? That sort of thing.
It's funny you asked that because literally 3 days ago I was writing a long, winding, partly scientific post about the serum, that tumblr graciously ate up and I never saw it again. A travesty. I plan to rewrite it though.
That post focused on the popular headcanon that Steve's default temperature is higher than the norm, and that he's basically a portable space heater lol!
In short, there is some scientific basis for that, since chemical reactions in organisms are mostly controlled by enzymes and enzymes work the fastest around 40 °C. I think it's plausible Steve's brain would program his default temperature to be higher, because in order for faster healing and metabolism his body HAS to work in that optimal area, or maybe even more effectively than that!
As for what the serum did to him, I think it made his cells replicate like crazy, and embedded itself in his DNA/genetic code so that his body could replicate and produce it on its own.
One of my random headcanons is that Steve's neurons/brain cells can replicate, which is something a normal human's brain cells cannot do. Not sure if he could regenerate stuff like entire limbs, but I guess he could restore his sight or hearing if he lost it?
Some things that might be annoying - the enhanced senses that pick up on so much stuff at all times! I think it would be easy for Steve to experience sensory overload, especially in crowded or loud places. He might smell and taste much more strongly than a normal person. His pain receptors are more sensitive. Maybe he sees colors that a normal human eye cannot, but he doesn't even know because he has no frame of reference. Oh, reminds me, I like the headcanon that he was color blind before receiving the serum, so after he gets it, he just thinks that's what the colors look like for everyone.
And another annoying thing, his hair and nails grow like crazy! He has to trim them like, constantly. Now, does Steve cut his hair himself, or does he have a specialized Shield barber? Someone is employed at Shield for the sole purpose of styling Captain America's hair. I like to think he has an overenthusiastic barber who treats him like a show dog. But at least he gets a nice hair cut, lol.
I think I could come up with more stuff, and I'm sure I have a lot more lodged somewhere in my brain, but these are the things that came to mind first :D
Ask me about Steve or the MCU!
Cold hands?
Per-serum!Steve: .... . -.-- --..-- / -... ..- -.-. -.- .-.-.- .-.-.- .-.-.-
Bucky: -.-- . ... --..-- / ... - . ...- .. . ..--..
Steve, quickly putting his hand up Bucky's shirt for the fifth time this week: .. .----. -- / -.-. --- .-.. -.. .-.-.-
Bucky, arching away from Steve: * ..- -. .... --- .-.. -.-- / ... -.-. .-. . . -.-. .... .. -. --. *
××
Post-HYDRA!Bucky: .... . -.-- --..-- / ... - . ...- .. . .-.-.- .-.-.- .-.-.-
Post-serum!Steve: -.-- . ... --..-- / -... ..- -.-. -.- -.-- ..--..
Bucky, quickly putting his metal hand up Steve's shirt for the fifth time this week: .. .----. -- / -.-. --- .-.. -.. .-.-.-
Steve, arching away from Bucky: * ..- -. .... --- .-.. -.-- / ... -.-. .-. . . -.-. .... .. -. --. *
Bucky: .--. .- -.-- -... .- -.-. -.- / .. ... / .- / -... .. - -.-. .... .-.-.-
Per-serum!Steve: Hey, Buck...
Bucky: Yes, Stevie?
Steve, quickly putting his hand up Bucky's shirt for the fifth time this week: I'm cold.
Bucky, arching away from Steve: * unholy screeching *
××
Post-HYDRA!Bucky: Hey, Stevie...
Post-serum!Steve: Yes, Bucky?
Bucky, quickly putting his metal hand up Steve's shirt for the fifth time this week: I'm cold.
Steve, arching away from Bucky: * unholy screeching *
Bucky: Payback is a bitch.
Season 2: Redemption
Sam is preparing to inject Gabe who begs Sam for his life and humanity.
Snooping around into Gabe's apartment, Vincent finds that bottle of beast serum that JT made, taped up nice and neat underneath a desk
New Chapter!
An Archive of Our Own, a project of the Organization for Transformative Works
Season 2: Till Death
Gabe's outright offended that Cat would distrust him after all he’s done to prove to her that he’s changed. Gabe looks into Vincent’s eyes and tells him, beast-to-beast, that he never set eyes on that vial in his life, and it’s an admission Vincent has no choice to believe, since he would have been able to detect Gabe’s lie with his abilities (however, in a precinct scene with Vincent, after interrogation room, Cat mentions the possibility that a former beast would know best how to avoid another beast’s methods of detection. Did Gabe just game the system?).
A big amount of the episode was spent to try to save Gabe and keep telling us he is now Mr. Perfect and that he did every thing to redemptive himself , he did every thing to protect Cat and Vincent to make up for his fault , he earned his second chance , it is not fair to identify him for his past not his present. Or, they spent 10 episodes destroying VinCat and making Vincent as bad as Gabe was on S1. Exactly to prove that the bestial side of these creatures is almost uncontrollable and it takes a great man to overcome it. And this man is Vincent. The other 3 episodes were about Vincent getting out of his dark place and starting to find his way back to himself, getting rid of his brainwash, anger, confusion and everything else that caused his doom. Gabe didn't have any evolution while Vincent had a whole journey of descending to darkness and coming back to the light. Gabe is there only to provide an antagonist to Vincent, the same way Tori was there just to provide an antagonist to Catherine. So now the big question is: HOW THEY CAN FIX THINGS AND SOLVE CATHERINE/GABE THING ESPECIALLY SO FAST ?
Just my speculation.