Vitamin D is the collective name for steroid hormone precursors, called calciferols. According to the structure, we distinguish between vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol), their biological effectiveness is similar.
If we talk about vitamin D without further specification in this recommendation, it does not matter in the given context what type or metabolite it is. In other cases, we use specific terminology.
The following joint recommendation of the two pediatric societies of ČLS JEP is based on published consensus of international professional societies, especially the Global Consensus for Prevention and Therapy of Rickets (Munns 2016), in which experts from pediatric endocrinology, osteology and gastroenterology and nutrition participated. ESPGHAN (Braegger 2013), further research in this area may bring further knowledge and possible changes in best practices.