Could mixing COVID vaccines boost immune response? (nature.com)
I'm not a doctor.
IMO it is feasible if you are younger and have no underlying health issues.
A vaccine is just to prompt an immune response.
All so far seem to be over 50% effective or greater.
So at least as effective as the flu vaccine.
All seem to have side effects in a small number of the population, some more publicized/fatal/significant than others.
If you are young or had covid already, one vaccine should be sufficient as a booster.
If older or have underlying health issues best to stay on the side of caution, always consulting a doctor before every move.
One has to remember the vaccine is not a guarantee or magic bullet.
Your immune response and overall health play greater roles.
One has to remember how quickly these vaccines came to market.
Profit motives and bragging rights are high right now, compared to/under the guise of the greater good.
We can only go on what the makers tell us and take it as "truth" whether it is or not.
Like a first year production vehicle it's hard to know all there is to know about them.