Use Yeast Nutrient or relying on Nutrient from Mash?

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k_kimes
Use Yeast Nutrient or relying on Nutrient from Mash?

Some claim that the mash process creates all the nutrients necessary for good fermentation. Others claim that adding yeast nutrient such as 1/2 teaspoon of wyeast yeast nutrient or some other zinc addition makes for a better fermentation and better beer particularly when brewing with RO water. Has anyone done side by side experiments to prove this one way or another?