Blood is constantly being produced in the body – [about two million red blood cells per second](https://www.blood.co.uk/the-donation-process/after-your-donation/how-your-body-replaces-blood/#:~:text=Your%20body%20makes%20about%202,up%20stores%20of%20them%20again) from the marrow inside your bones. It takes approximately 4-6 weeks to fully restore the donated blood.
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