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Retinol and vitamin C have stronger evidence for visible change

Route: Oral (arginine salt form preferred) Dose: 0.5 to 1 mg daily Timing: On empty stomach for best absorption Duration: 4 to 8 weeks typical Expected timeline: 1 to 2 weeks for initial improvements User reports describe improvements in bloating, digestive discomfort, and bowel regularity within one to two weeks, with full therapeutic benefit emerging over four to six weeks

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Dose-finding studies for CNS effects in humans are needed because extrapolation from rat doses is unreliable