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The best nervous system regulation tools rank not by clinical efficacy in ideal conditions but by what's available in the moment your capacity is lowest. Functional fragrance ranks first on combined speed and friction (3 to 10 seconds, zero setup, works without requiring prefrontal initiation). The physiological sigh ranks second. Higher-friction tools (cold plunge, meditation, vibration plates) rank lower for acute use but compound the most over weeks of consistent practice.