Which of the 87 vaccines in development do you want to know about? I guess the Pfizer, Astrazeneca, and Moderna are the ones being looked at for emergency use approval. The Astraseneca probably will not be approved with the current data. The Pfizer vaccine has significant logistical barriers to its distribution. So I will just use the Moderna vaccine (mRNA-1273) as the example.
This is an mRNA vaccine that instructs your cells to make the stabilized version of the spike protein of SARS-CoV-2, the virus that causes COVID-19. This mRNA is coated in lipid nanoparticles to protect it and to aid entry through cell membranes. So, the primary ingredients are mRNA and lipids. The molecular structure of these is not available at this time, but even if you where a biochemist molecular structure would be of little value in assessing the safety of the vaccine. So, there you have what is in it, and how it works.
The adverse events have been short lived chills, fever, headache, shortness of breath, fatigue and muscle pain up to this point.
SARS-CoV-2 itself instructs your cells to manufacture this spike protein, so it is unlikely that the vaccine will do anything that COVID does not already do. Part of the reason Moderna was able to turn out a vaccine so fast is because they have spent more than 2 years working on a vaccine for MERS-CoV, another corona virus.
There are unknowns, I have not denied those in any of my previous posts, yet you still chose to be insulting and claim global ignorance on my part and that of the entire healthcare community while being too apathetic to write more than two sentences to back that up. What if is an easy game to play, it cuts both ways, and unless it focuses on facts and what can actually be known it is an exercise in paralysis.