Individuals with symptoms of deficiency.
Older adults (ageing can affect absorption and the ability to produce vitamin D from sunlight).
Individuals with darker skin tones.
Individuals who spend most of their time indoors.
Individuals with bone health concerns.
Pregnant and lactating women.
Individuals with poor diets.
Individuals with malabsorption issues such as coeliac disease, crohn's.
Individuals on medications that can interfere with metabolism and absorption.
Individuals with chronic kidney disease.
Young children for growth and development.