How to get the alien aura serum?

Reach level 10 of the scientist career.

https://www.carls-sims-4-guide.com/careers/gettowork/scientist/

If Sims 4 was like Animal Crossing I could send you some. :p

@simgirl1010 thank you!

Or download a retail store that sells serums/inventions and visit it in game.

Thank you @EmmaVane ! I completely forgot that kind of solution...
I'm almost finishing my sim's distinguished degree in physics now, so this time i'm going for the scientist career route.