l-carnitine and fasting Fast&Up Lean Body 2000 mg (60 Effervescent Tablets) Orange Flavour Seeking Health Acetyl-L-Carnitine - Acetyl-L-Carnitine
Description
Science 363 , 644649 (2019)

It helps avoid going back to a deficiency

[DOI] [PubMed] [Google Scholar] Oudraogo O., Amyot M

Likewise, metabolites accumulated after long term utilization of pharmacological therapies, such as valproate [79] and the antibiotic cefditoren pivoxil [80], can be conjugated to carnitine and result in carnitine depletion

This means the coenzyme can continuously cycle between the NAD + and NADH forms without being consumed
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