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While the efficacy of levocarnitine injection to increase carnitine concentrations in patients with ESRD undergoing dialysis has been demonstrated, the effects of supplemental carnitine on the signs and symptoms of carnitine deficiency and on clinical outcomes in this population have not been determined

But, there are some downsides: They need regular shots, which might not fit everyones lifestyle

Berberine and Its Role in Chronic Disease

These associations were also robust to different methods and evident for acetyl-carnitine

K.OrabiD.et al (2022)

Both experienced increased heart rate, trouble breathing, and swollen tongues