supplement feeding

Casey and Don James <macivor@...>

If I am understanding correctly, we are trying to give our horses the nutrients they need by analyzing their main forage source, then supplementing the nutrients which are low in the forage, while, at the same time,  not inadvertently adding substances that may cause harm, such as iron or NSAIDs.   
My questions are:
How do supplements, such as Movease, figure into these calculations?
Is there a way to know if a product might contain herbs or other substances with iron or herbs or other supplements with anti inflammatory properties similar to NSAIDS. 
thanks for help!
casey oregon 2015

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