Hire CIPD Assignment Writer writer: Call/Whatsapp chat: +1 (781) 253-4162 Vitamin D has two main varieties, D2 and D3. It is a steroid compound that plays A necessary role in regulating calcium and phosphorus metabolism. This doc defines vitamins, describes the differing types such as their resources and functions. https://alfreda567rqn7.wikiannouncing.com/user