Since I live at a 42-47 degrees North latitude, I take Vitamin D supplements. Also, I take some Calcium a few times /week for my slightly porous bones. Other than that, I let my diet give me the vitamins and protein that I need.

I used to take a multi-vitamin but stopped about a year ago. I found myself eating more vegetables and fruit on non-fasting days and at some point didn’t see any benefit from the multi-vitamin. If I start seeing signs of some deficiency than I would start taking it again. As far as I can tell, fasting hasn’t had any negative impacts but not eating fruits and vegetables has a huge impact.

Thank you so much for sharing this information….

Supplements need nutrition to keep the body well-functioning. These won’t work unless your stomach has something to burn! Whether these are Weight Loss Supplements or Other supplements, you need to eat properly and in proper proportions too.
Hence, the conclusion is that you should avoid taking vitamins/supplements while fasting.

I don’t take anything on a FD that I wouldn’t take any other day.

Because I have a chronic health condition I have regular monthly blood tests which include looking for vitamin & mineral deficiencies. When my doctors tell me I need either a supplement or a change of diet I follow their advice. The only supplement I take every day on my GPs advice is vitamin D. I also take fish oil daily on my rheumatologist’s advice.
At times my iron or potassium levels are low and I use a combination of diet and supplements to rectify this. Once they are normal I can usually stop the supplements.

I don’t take vitamins or supplements while fasting but I saw some people that take supplements while they were in it’s fasting state.

I usually take vitamin D and iron used to take multi vitamins
But I suppose you should talk with doctor