My finger nails and hair are suffering due to three years of taking Warfarin.

The answer

There is no evidence that taking any vitamin supplements will affect hair and nail growth. If you have a folic acid deficiency your doctor would prescribe the relevant vitamin replacement tablet needed to make the blood levels normal again. It would not be sensible to take any supplements without being prescribed them by your doctor, as high levels of some vitamins can have detrimental effects. This is even more important if you are on blood thinning medications such as rivaroxaban or warfarin. Hair and nails can become thin if your iron levels are low, so it is worth getting checked out by your doctor to make sure you are healthy. Otherwise a healthy, well balanced diet is still the very best way to make sure your body has all the vitamins and minerals that it needs.