What should you know about hair loss due to vitamin D deficiency?

Vitamin D supports several body processes, and low levels may be considered alongside hair loss, fatigue, generalised weakness, low mood, or frequent infections. These symptoms are not specific to vitamin D deficiency. Hair shedding can also follow illness, stress, hormonal changes, scalp inflammation, medication changes, or inadequate nutrition. A clinician considers sun exposure, diet, absorption problems, medical history, and medicines before deciding whether testing is useful. Obesity can be associated with lower vitamin D levels, but it does not establish the cause of hair loss.

Book an assessment if shedding is new, persistent, patchy, or accompanied by other symptoms. Bring a list of supplements and medicines, and describe whether hairs are falling diffusely or in defined patches. Do not start large doses of vitamin D based on hair loss alone; excess supplementation can be harmful. If deficiency is confirmed, follow the prescribed replacement plan and discuss diet and suitable sun exposure for your skin and circumstances. Hair growth may not change immediately after an underlying problem is corrected.

Seek prompt review for sudden patchy loss, scalp scarring, severe scalp pain, or hair loss with marked weakness, bone or joint pain, repeated infections, or worsening low mood. Urgent help is appropriate for severe weakness, confusion, difficulty walking, or symptoms suggesting a serious illness. A Stress Fracture can cause focused bone pain and needs assessment rather than self-treatment with supplements.

Should my vitamin D level be checked, and are other causes of shedding more likely? Which supplements are appropriate for me? How should I monitor the scalp and hair pattern while we investigate?