A Pragmatic Assessment of Influenza Vaccine Effectiveness in the DoD (PAIVED) This phase 4 study enrolled over 15,000 participants.
A Study to Evaluate a Modified RNA Vaccine Against Influenza in Adults 18 Years of Age or Older Over 30,000 participants completed this phase 3 study.
Each of these describes a single study. The typical drug approval process consists of conducting several studies at each phase of clinical trial.
If you want some bonus reading, go to the FDA website, choose a drug, and read all of the approval documents. There are usually several hundred pages of these.
I've yet to see any "alternative" practitioner publish a single study that even comes close to approaching the size, detail, and scope of the clinical studies required to obtain FDA approval.
Big piles of excrement are still excrement.
I would not trust any study provided by Big Pharma.