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Nitric oxide formulas are stimulant-free blends built around ingredients such as citrulline, arginine and beetroot nitrates. They are often taken before training instead of, or with, a caffeinated pre-workout. Compare the amount of each ingredient per serving.
Nitric oxide: questions
Do nitric oxide formulas contain caffeine?
Most do not. Check the label if you want a stimulant-free product.

