There are currently very little side effects expereienced with most stem cell therapies when applied by a licensed medical provider who has been trained in the extraction and applcation of stem cell therapies. When applied safely , stem cell therapy carries very little risk. Some minor after effects experieced may be some mild soreness at the extraction and injection site. If applied improperly stem cells along with other compounds, medications, and alteranative treatments can cause a poor outcome, but stem cells themself are NOT harmful .