My multivit does have all 3 of those in it, although in quite small amounts:

Potassium Iodide: 65mcg
Calcium Citrate Hydrate: 50mg
Magnesium amino acid chelate: 25mg
Manganese amino acid chelate: 5mg.

Do you suggest I supplement with additional potassium? I must admit I am feeling quite tired, my legs are usually a little crampy - because I have a mild spinal injury and the muscles are very hard to condition, although maybe potassium has been a problem for a while? Will go and find something after work tonight.

How soon do you think I should see a difference?

Thanks for your help!
Jane.