The 3 biggies in LCing are:

• A good multi vitamin
  
• A calcium / magnesium combination supplement- ratio usually 2:1, chelated (malate, citrate - not calcium carbonate) 1200-1500mg RDA for cal / 400-600mg RDA for Magensium
  
• Potassium - either in pill form or from a salt substitute such as Morton's Light Salt, or NuSalt. 400mg a day (4 pills or 1/8th of a teaspoon of salt substitute) - potassium comes with a warning; if you're on certain medications (beta blockers) or if you've got a history of heart problems and/ or high blood pressure check with your doctor or specialist first. Potassium should always be supplemented when you're well hydrated.

Anti-oxidants are up there on the list of vits and supplements that are highly recommended for any way of eating. These include:

• Vitamin C - 1000mg, either a time release forumla or in 250mg doses
  
• Vitamin E - 400 I.U. is the minimum
  
• Beta-Carotene - about 5,000-10,000IU per day of beta-carotene will give you 3-6mg of Vitamin A

Supplement Resources is a good thread to check out - you'll find links to websites with reviews of different supplements along with recommended doses.

HTH
Nat