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I bought both, photographed both bags, and transcribed both Supplement Facts panels line by line. Grüns has the better formula: zero added sugar, a third the calories, and five more nutrients at doses that matter. AG1 has the better product: it tastes better, costs about $121 less a year, and carries the only NSF Certified for Sport mark in the comparison. Full breakdown of price, ingredients, testing, the Prop 65 lead warning, and who each one is actually for.