Short answer: Have low blood pressure, kidney disease, or are scheduled for surgery — amino-acid circulation supplements should be reviewed with your physician first.
Why kidney disease specifically connects to amino-acid supplements
Amino acids like L-Arginine and L-Citrulline are processed and cleared by the kidneys — a genuine, mechanism-based reason this specific condition warrants physician review.
Why this caution is grouped with two other, related conditions
Low blood pressure and scheduled surgery share this same "review with your physician first" instruction — three related, cardiovascular-adjacent circumstances.
⚠️ Worth knowing: if you manage a cardiovascular or kidney condition, consult your healthcare professional before use.
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