Short answer: Not for use during pregnancy or nursing without physician approval — a direct, conditional caution rather than an unconditional exclusion.
Why "without physician approval" is a specific, conditional phrasing
This differs from an absolute exclusion — instead, it directs pregnant or nursing individuals to a specific decision-maker (their physician) rather than a blanket no.
Why this caution connects to arginine's broader safety profile
Given the formula's blood-flow and blood-pressure effects, physician oversight during pregnancy or nursing reflects a genuinely sensible, mechanism-based precaution.
⚠️ Worth knowing: not for use by anyone under 18 or those pregnant or nursing — this appears directly in the formula's footer disclaimer as a repeated, reinforced caution.