Under physiological pH conditions, L-carnitine is a zwitterionic ion
Results in 4-8 weeks
However, heat-tolerant cultivars have mechanisms that reduce membrane damage, such as decreased electrolyte leakage and lipid peroxidation under heat stress

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10.1016/j.psyneuen.2016.11.031 Psychoneuroendocrinology 53 LiuX.PingS.GaoW
Importing for personal use generally does not trigger enforcement action, though products intended for human therapeutic claims face stricter scrutiny