Is vit d3 same as vit d?

Vitamin D exists in several forms, with vitamin D3 (cholecalciferol) and vitamin D2 (ergocalciferol) being the most common. While both forms can help maintain adequate levels of vitamin D in the body, vitamin D3 is generally considered more effective at raising and maintaining overall vitamin D levels. Therefore, while they are both forms of vitamin D, they are not identical in their sources and efficacy.