l carnitine causes anxiety L-Carnitine in the Treatment of Psychiatric and Neurological Manifestations: A Systematic Review GABA: Genetics, Anxiety, and Immune
Description
In addition to the routine medication, the intervention group received 1000 mg oral L-carnitine tablet (Karen pharmaceutical Company, Iran) every 8 h for five days (3 gr daily)

On the other hand, lower levels of another neuroprotective KP metabolite (picolinic acid (PIC)) has been reviewed in suicidal attempts [158]
Front Reprod Health 2022

Nitric oxide boosters do not contain nitric oxide, but instead provide it via the amino acid arginine, which the body converts into nitric oxide
