l carnitine leading to cholesterol Revisiting the Role of in Heart Disease Through the Lens of the Gut Microbiota Amazon.com: THORNE L-Carnitine - Amino

A number clinical trials and case studies have reported efficacy of ALCAR for neuroprotection in conditions leading to central or peripheral nervous system injury in adults [1, 4, 722]

Moreover the duration of the L-carnitine supplementation differs from one study to another, therefore further studies are required to test the time dependence of the observed effect as well as the impact of L-carnitine bioavailability on the Lp(a)-lowering activity

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So I dont think this aspect is a concern

A: When administered by qualified medical professionals in appropriate doses, IV Carnitine Therapy is generally considered safe