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In all studios I build with my company we put a layer of 4 to 8mm of asphalt in the resilient sandwich (so between the two gypsum boards layers, sometimes we add other stuff too - depends on the needs really.)
In europe it's commonly refered to as "Roofing".
It's cheap per m², around 6-7€, max.
Works very good at dampening the vibrations and at adding mass to the wall (if you need that part, not always the case).
Green glue... it's way too expensive for what it is. And asphalt-type layers work much better.
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