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Some research shows that L-arginine, found in nitric oxide supplements, could improve fitness performance for runners, cyclists, and swimmers. But, other research has shown little to no effect.

Some research shows that L-arginine, found in nitric oxide supplements, could improve fitness performance for runners, cyclists, and swimmers. But, other research has shown little to no effect.

Some research shows that L-arginine, found in nitric oxide supplements, could improve fitness performance for runners, cyclists, and swimmers. But, other research has shown little to no effect.