When you’re struggling with symptoms of a vitamin deficiency, it might feel like any time waiting for a remedy to kick in is too long. In most cases, it takes three to six weeks to see actual results from a multivitamin as levels build in your body, but it can take up to four months. However, you might see results sooner if you’re highly deficient or particularly sensitive to change. The only downside of multivitamins is that you may not see results if you aren’t already deficient. If months go by and you still don’t feel any different, it may be time to call the doctor to see if you can get your vitamin and mineral levels tested.