What to know about vitamin D deficiency in pregnancy

Vitamin D helps the body handle calcium and supports bone and muscle function. Low levels may cause no obvious symptoms, so tiredness or aches alone cannot confirm a deficiency. A clinician may consider your health history, diet, sun exposure, skin coverage, medicines and other risk factors, and may order a blood test when appropriate. Pregnancy supplements differ in their ingredients and strength; taking several products together can unintentionally increase intake.

Show your maternity clinician every supplement, multivitamin and herbal product you use. Follow the recommended product and dose, and ask whether a repeat blood test is needed. Food sources such as oily fish, eggs and fortified foods may contribute, but diet alone may not correct a confirmed deficiency. Do not use a high-dose product, stop a prescribed supplement, or rely on sun exposure as treatment without personalised advice. Keep routine antenatal appointments so your clinician can consider your calcium intake and overall pregnancy care.

Contact your maternity team promptly if you have persistent vomiting, marked weakness, confusion, severe muscle weakness or symptoms after taking more supplement than advised. Seek urgent care for breathing difficulty, fainting or severe illness. These concerns may not be caused by low vitamin D, but they need assessment during pregnancy.

Ask whether testing is suitable, what your result means, which supplement is appropriate, and when to review it. Check whether your prenatal vitamin already contains vitamin D and how to avoid doubling ingredients.