Wild nutrition foodgrown vitamin d provides a high strength of 1000iu which is highly absorbable biologically active not storage form of vitamin d3 this naturally includes all forms of vitamin d including vitamin d3 d2 and d1 high absorption and retention in the body reduces the need for high dosing long term public health advice recommends supplementation for all during autumn and winter and for certain individuals or at risk groups during spring and summer too the department of