Safety · 4 min read
Stem cell therapy side effects: what to expect
The effects patients may notice, how long they last and what is monitored before, during and after your application.
Short answer
The most common effect after an application of mesenchymal stem cells is a mild, passing fever. Some people feel tired or have a headache for a day. A 2026 systematic review of 42 randomised trials with umbilical cord cells given intravenously found a favourable safety profile, with fever as the only more frequent effect.
In 30 seconds
- Mild fever is the most reported effect and usually passes quickly.
- Tiredness, headache or soreness at the IV site are mild and temporary.
- You are monitored before, during and after the application.
What do studies say about safety?
Mesenchymal stem cells have been studied for years in thousands of patients. An updated 2026 review of 42 randomised trials with umbilical cord cells given intravenously, with more than 2,000 patients, found no safety signals other than a higher rate of fever. An earlier review of 55 trials reached the same conclusion.
How long do the effects last?
Most effects appear in the first hours and fade within a day or two. Rest, hydration and the instructions your team gives you in writing are usually all you need. Your coordinator stays in touch while you are in Guadalajara.
What is monitored?
- Before: a physician reviews your history, imaging and medication.
- During: vital signs are checked throughout the application.
- After: a medical check before you fly home.
- At home: follow-up at 30, 90 and 180 days.
Is this for you?
- You want to know what to expect after your application.
- You can share your history and medication list for the assessment.
- You value being monitored by a medical team at every stage.
Frequently asked questions
What is the most common side effect?
A mild, passing fever in the first hours after the application.
Can I fly home after treatment?
Yes. You have a medical check before your flight, usually 2–3 days after arriving.
Do I need to stop my medication?
Your physician reviews your medication during the assessment and tells you what to do.
Who do I contact if I feel unwell at home?
Your coordinator and medical team stay in contact during your follow-up.
Stemlife Clinic at a glance
- Location
- Guadalajara, Mexico · Hospital Puerta de Hierro Andares
- Cells
- Mesenchymal stem cells from Wharton’s jelly (umbilical cord)
- Treatment
- One application in a single day; plan 2–3 days in Guadalajara
- Price
- From USD 5,000, confirmed after a free medical assessment
Medically reviewed by Dr. Guillermo Quezada Navarro · November 2026
Sources
- Safety of intravascular administration of umbilical-cord-derived mesenchymal stromal cells: an updated systematic review and meta-analysis. Stem Cells Transl Med. 2026.
- Cell therapy with intravascular administration of mesenchymal stromal cells continues to appear safe: an updated systematic review and meta-analysis. EClinicalMedicine. 2020.
- ISSCR · A Closer Look at Stem Cells
General educational information. Individual results vary and are not guaranteed.
