Whole Earth & Sea Vitamin D3 from Natural Factors is formulated to support healthy bone development and immune system health. One daily capsule delivers a natural, highly absorbable form of vitamin D3 called cholecalciferol. Derived from sustainably harvested non-GMO lichen, our formula is an excellent source of vitamin D3 for strict vegetarians and vegans. This bioactive supplement is third-party certified by ISURA, which tests for GMOs and over 600 contaminants.