Who might be deficient in vitamin D3?

So, what are the symptoms of a vitamin D deficiency? Fatigue, hair loss, back and muscle pain, and even depression can be symptoms of a lack of vitamin D3. More than one billion people worldwide are estimated to be deficient in vitamin D3. The UK government recommends a vitamin D3 supplement for several key groups of people, including:

• People over 65 years of age

• Those with low or no exposure to the sun

• Pregnant and breastfeeding mothers

• Young children from six months to five years old