Short answer: L-Arginine is not recommended after a recent heart attack, and amino acids require renal processing — two specific, distinct medical exclusions worth understanding separately.
Why these two conditions are named together but for different reasons
The heart-attack caution relates to arginine's cardiovascular effects specifically, while the kidney-disease caution relates to how amino acids are processed and cleared by the body.
Why "amino acids require renal processing" is a specific, checkable reason
This direct explanation gives you the underlying mechanism, rather than a vague "consult your doctor if you have kidney issues" caution alone.
⚠️ Worth knowing: these are documented interactions, not a formality — worth taking this caution seriously if either applies to you.