Metamucil

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I'm on <20g carbs / day. I just got some metamucil and each pack is 5.8g, contains 20 calories, and 3.4g of psyllium hydrophilic mucilloid. Is that ingredient, pure fiber, and what is the other 2.4g in the package?

I'm counting active carbs (carbs that are not fiber) precisely and want to know if there are any hidden carbs in metamucil I gotta watch out for. Thanks.