I've tried Zinc, C, D, E, Omega 3 fatty acids, organic multivitamins, and cold pressed flaxseed oil with not too much difference. The Zinc made me throw up on the third day because apparently taking 25mg was way too much for me, and the omega 3's gave me headaches. Everything else MUST be eaten on a full stomach. Vitamin D seemed to be the only single break through for myself when it came to the oiliness/softness of my skin. Currently I am not taking it but will restock in spring.

You should really try only a few of these at once, then wait several weeks before deciding if you see any kind of improvement at all. It's best to get the vitamins naturally from your daily diet, but the fatty acids may serve you well as long as you don't mind the huge size pills. Just make sure you eat some food, take them, then finish eating.

Side effects can be random... mine is usually nausea and vomiting. Long term use of any kind of vitamins have shown to cause more harm than good actually.

I agree with the above poster. Vitamins can end up being costly and a waste if you take them all at once as you won't know what is helping or hindering. I have taken a lot of teh vitamins you listed but noticed ZERO improvement.