Two people in the United Kingdom have been given lab-grown red blood cells for the first time in history in what could be a medical breakthrough. 

The red blood cells, manufactured using stem cells from donors, could revolutionize blood transfusions, according to the NHSBT health authority of the UK.

The synthetic blood could be used for critical procedures including treating people with blood disorders that require regular blood transfusions.

However, at this time, the project is still in its trial phase and time is needed before its effects are proven.

The two people who received the lab-grown blood were reported to have experienced no side effects.