Vitamin D
Vitamin and mineral supplements support general health or address a specific deficiency, and are widely used alongside or instead of dietary intake
About vitamin d
Vitamin and mineral supplements support general health or address a specific deficiency, and are widely used alongside or instead of dietary intake
Treatments
Symptoms
Most people can get the vitamins and minerals they need from a varied, balanced diet, but supplements can help where intake is limited, absorption is reduced, or requirements are higher, such as during pregnancy, in certain age groups, or in specific diets like veganism. Common examples include vitamin D, B12, iron, folic acid and multivitamins
Diagnosis
Suitability is usually assessed by discussing diet, lifestyle, health conditions and any symptoms of deficiency. Blood tests can confirm a specific deficiency, such as low vitamin D, B12, ferritin (iron stores), or folate, where this is suspected
Treatment
The right supplement, strength and course length depends on the nutrient and whether it's for general maintenance or correcting a confirmed deficiency, which may need a higher "loading" dose initially followed by a lower maintenance dose
Prevention and self-care
• Eat a varied, balanced diet where possible
• Take supplements as directed rather than exceeding recommended doses, as some vitamins can be harmful in excess
• Get safe sun exposure for vitamin D where appropriate
• Review supplement needs during pregnancy, breastfeeding or with specific diets
• Have levels rechecked periodically if treating a confirmed deficiency
• Store supplements safely away from children
Reviewed by Hamza Iqbal Naheed, Superintendent Pharmacist, GPhC 2209194 (check the register) · Last updated 22 September 2026