Pregnancy, breastfeeding and fertility while taking thiamine

Thiamine can be taken during pregnancy. However, only take it if your doctor has recommended or prescribed it for you.

You can usually take thiamine while you are breastfeeding. However, only take it if your doctor has recommended or prescribed it for you.

If you have low thiamine levels, it's important that this is treated so that your milk contains enough thiamine for your baby.

Because thiamine is a natural part of breast milk, it's unlikely to cause any side effects in your baby even when it's taken as a supplement.

If you notice your baby is not feeding as well as usual, or you have any other concerns about your baby, talk to your doctor, pharmacist, health visitor or midwife.

There's no evidence that thiamine affects fertility in either men or women.