I was
told that it can take 3 months or longer to correct vitamin and mineral deficiencies by my M.E doctor, and that's if you are taking the correct dosages and the correct type and you are able to absorb them. Some people use transdermal minerals to bypass absorption issues. I tired this with an iron spray as i didn't seem to be able to get my iron up by oral supplementation, however this didn't work either which made me wonder if any of the transdermal ones actually do work.
I think many people give up on them way too soon - also many vitamis are supportive, I don't believe you will always feel a difference, it can be subtle, or they could be stopping you from further harming your body or protecting it in the future.
What vitamins did they test for and what were your results?
I have a general issue with antioxidants, CoQ10 is very low, carnitine very low, niacin and B12, iron, selenium and manganese. The only one I noticed that made a difference in supplementing was the B12 and that was because I did daily injections of Methyl B12 for about a year.
Take care,
Justy.