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In a before-and-after study with large sample size (214 infertile PCOS women with a history of previous IVF failure) has been reported that the embryo quality on days 3 and 5 were significantly increased after L-carnitine administration

Diet is a factor here (with meat once again being the best source)

acetylation, methylation or glycosylation), transduce the information on the cell metabolic status, and modulate the activities of signaling proteins, enzymes, and transcriptional regulators 3

Acylcarnitine then diffuses across the outer membrane and is transported across the inner membrane by carnitine-acylcarnitine translocase (CACT)