On 5 August 2021, Medisa Ara Gostar organized a webinar about the impressive role of Hydroxo cobalamin liposomal and its superiorities upon other three forms of cobalamin to threat the patients with MMA disorders, which caused by a deficiency of vitamin B12. In this webinar some of Pediatric endocrinology and children metabolism professors including Dr. Peymaneh Sarkhail and Dr. Farzaneh Abbasi from Tehran, Dr. Hossein Moravej from Shiraz and Dr. Noushin Rostampour from Isfahan participated. At the end of the webinar, frequent questions were answered.