taurine or acetyl l carnitine alcar L-Carnitine Powder: Optimize Brain Health and Energy with Supplement Acetyl-L-Carnitine – Core Nutritionals
Description
In this study, viability, motility, mitochondrial membrane potential, and DNA fragmentation index of sperm cells were analyzed in fresh and frozenthawed semen, in both experimental (with cryomedium containing L-carnitine) and control groups

Nava-Coulter Brett

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This is also an illustration of the fact that, in addition to the occurrence of merely metabolic control factors, such as the lack of adequate levels of cofactors or precursors for biosynthesis, transport limitations can occur during biotransformations (see previous section)

ESPEN micronutrient guideline
