Regarding the first part (the 2nd concerning COVID), I recently discovered the potential benefits of fermented foods as it relates to mitochondria & CoQ10.
Regarding COVID, though “less effective”, I believe J&J was the lesser evil.
Unfortunately, the IgG and Covid vaccine study I mentioned only obtained sujects with Phizer and Moderna Covid vaccinations. In a much larger study, it would be valuable to also include J&J as well as other vaccines in use worldwide.