To date, there has not been a single study – to our knowledge – that has compared different types of stem cells, concerning safety and efficacy, particularly in autism. There are currently many types of stem cells available to use in different conditions including embryonic stem cells, mesenchymal stem cells (ex. bone marrow and umbilical cord stem cells), hematopoietic stem cells, neural stem cells, as well as many other sources (8).

However, when looking at other similar neurodevelopmental disorders and at different stem cell therapy trials, the most feasible and safely-used stem cells that have been used and tested in autistic people and other neurological conditions include umbilical cord-derived samples, both cord blood and cord tissue, and bone marrow stem cells. These two types provide the best results with the lowest possible side effects (8, 9).

We have also tested and published an article on the better efficacy of using both types of umbilical cord samples, umbilical cord mesenchymal cells and umbilical cord blood/hematopoietic cells, concomitantly – while maintaining safe administration (11). These results have contributed to establishing our current method of dual-type stem cell administration.