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Bibcode:2002PNAS...99.2356L

For most people, taking 2 g or less per day is relatively safe and unlikely to cause serious side effects

In a randomized, placebo-controlled study of 495 patients with intermittent claudication, 2 g/day of propionyl-L-carnitine for 12 months significantly increased maximal walking distance and the distance walked prior to the onset of claudication in patients whose initial maximal walking distance was less than 250 meters (m), but no effect was seen in patients who had an initial maximal walking distance greater than 250 m (65)

Auch bei Herz-Kreislauf-Erkrankungen, schweren Nieren- oder Leberproblemen kann die Einnahme von L-Arginin gefhrlich sein und sollte nur nach Rcksprache mit einem Arzt erfolgen