Most twitches respond to magnesium therapy.

What vitamins exactly do you take? Vitamins are not minerals, but have magnesium stearate in them for manufacturing purposes. This form is not absorbed by the GI tract.

Foods with magnesium in them are not commonly eaten in the US.

This link explains the foods highest in magnesium:
http://www.healthaliciousness.com/ar...-magnesium.php

You can apply a lotion called Morton Epsom lotion to specific targets like around your knees. A little goes a long way. But you cannot use it around your eyes, or in large areas. You can rotate sites daily though, as one application lasts more than a day. It is really nice and absorbs well. Muscles settle down quickly with it, often in minutes.

WalMart, and Walgreen's carry it. So does Amazon online:
http://www.amazon.com/Morton-Epsom-L...n+epsom+lotion

You can soak in epsom salt baths for more full body effects..
6-8oz in a bath tub with lukewarm water...this often relaxes muscles and calms twitching too.

People who drink alcohol, and coffee in large amounts lose magnesium in the urine. If you use drugs to stop heartburn, you will not absorb magnesium well from food sources.
Doing exercise without attention to magnesium strains muscle functions quite a bit.