Special Report:
“The vaccine glows, at least Pfizer’s does,” Melissa Strickler, who worked for the pharmaceutical giant for nearly 10 years, said. “It looks like someone took a blue glowstick, cracked it open and put it in the vial, but only if there is light and it is around a dark background.”
Source:

https://www.youtube.com/watch?v=nARuP_wETDo
This is just the tip of the iceberg of the amount of money that big pharma spends of ads