Short answer: Stop at least two weeks before scheduled surgery — a specific, direct instruction worth planning around well ahead of any procedure.
Why a specific two-week window is given, not a vague "stop before surgery"
This concrete timeframe gives you something actionable to plan around, rather than an ambiguous instruction you'd have to guess the timing on.
Why this caution connects to arginine's core mechanism
Given arginine's role in blood vessel dilation and potential effects on bleeding risk, discontinuing before surgery is a genuinely sensible, mechanism-based precaution.
⚠️ Worth knowing: mention this supplement directly to your surgical team when discussing your pre-operative medication and supplement list.