1. The voluntary consent of the human subject is absolutely essential. This means that the person involved should have legal capacity to give consent; should be so situated as to be able to exercise free power of choice, without the intervention of any element of force, fraud, deceit, duress, overreaching, or other ulterior form of constraint or coercion; and should have sufficient knowledge and comprehension of the elements of the subject matter involved as to enable him to make an understanding and enlightened decision. This latter element requires that before the acceptance of an affirmative decision by the experimental subject there should be made known to him the nature, duration, and purpose of the experiment; the method and means by which it is to be conducted; all inconveniences and hazards reasonably to be expected; and the effects upon his health or person which may possibly come from his participation in the experiment. The duty and responsibility for ascertaining the quality of the consent rests upon each individual who initiates, directs, or engages in the experiment. It is a personal duty and responsibility which may not be delegated to another with impunity.

All 10 points of the Nuremberg Code here:
👉 https://history.nih.gov/download/attachments/1016866/nuremberg.pdf

Coercion

However, we seem to have forgotten pretty quickly and doing this now:

Sesame Street’s Rosita gets her first Covid-19 vaccine dose with CNN’s Dr. Sanjay Gupta

Or this:

It's a cult - Don't vaccinate healthy children.