dietary sources of acetyl-l-carnitine L-Carnitine | Linus Pauling Institute Acetyl L-Carnitine - Divine Bounty
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A.RobertsA

Liver-derived acylcarnitine can serve as an energy substrate, particularly during prolonged exercise or fasting

The accumulation of potentially toxic acyl species or imbalances in acylcarnitine profiles within the immature intestine might play a role in such injury pathways

[DOI] [PMC free article] [PubMed] [Google Scholar] 61.Wang B., Qiu J., Lian J., Yang X., Zhou J

Under exercise or stress conditions, the demand for carnitine increases

So essentially, more was being produced, but also, more was being excreted, resulting in an ongoing deficiency
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