This thread would be more appropriate in the Indigo-3G Users Forum.
The "standard serving size" is 6 caps and 6 caps contains 600mg. The recommended use is 4-6 caps per day. Most people take the full 6 caps, but some take 4 to stretch out the servings per bottle without a major compromise in effectiveness. 4 caps is basically the "minimum effective dose". It still works, but it's 100% optimal.