Since the procedure uses components from your blood, the risk of rejection
is very low.
However, when stem cells enter the body, they can trigger a type of immune or regeneration response. This may lead to mild symptoms that could be perceived as side effects.
Examples include mild cold-like symptoms (such as headache or dizziness) and light muscle aches. These symptoms typically subside within 1–2 days and are not a cause for major concern.