Plus, do you really thing that damaging the scalp frequently will not cause you side effect in long term ?
Do you believe that muscle building, fasting, dietary restriction, ice baths, saunas, etc. cause long-term side effects? Humans are not meant to be insulated from all stressors. If done following the proper protocol (i.e., using a well-designed tool at the proper depth and frequency in an aseptic environment), all available evidence indicates that microneedling is perfectly safe. There is a massive difference between chronic damage and acute, controlled inflammation.