Firstly, I don't believe in man-made chemicals, I accept the conclusions of the evidence for their efficacy. Second, I absolutely accept the ability of vitamins and minerals to treat specific conditions. For example, I accept Vitamin C cures scuvy. What I don't accept, nor believe in, is putative cures that have no evidence and no reason to believe they work.
Vitamins and minerals are medicine for some conditions. They are useless, or worse, for others. Most have their own side-effects.
For every doctor you can produce who claims vaccines cause autism, there are 999 others who say it does not. If you are going to trust the expertise of doctors, your decision is obvious.
I'm glad you've never been sick, and neither has your child. Your vaccination status has been irrelevant in that. There is no connection.