looking for complex carbohydrate supplement

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I'm looking for a complex carbohydrate supplement I can mix with water and drink on my training rides. Either a flavored or flavorless kind would work. Any recommendations?

You could try Sustagen Gold.

I'm looking for a complex carbohydrate supplement I can mix with water and drink on my training rides. Either a flavored or flavorless kind would work. Any recommendations?
Cytomax.

If you want to homebrew your own mix, use plain maltodextrin, Lite Salt, and no sugar flavoring like Kool Aid, Crystal Light, etc.