Potassium is an important supplement for the bodybuilder for muscle growth. Potassium maintains fluid within muscles. Greater fluid balance results in well hydrated muscles, and this puts the muscles in an anabolic state.

Sources of Potassium:

Bananas
Lean Meat
Low-Fat Milk
Potatoes
Yogurt

Recommended Potassium Intake for a Bodybuilder:

1,000 mg a day on top of your regular intake to maintain muscle hydration.