TGFB1 and myalgic encephalomeyelitis/chronic fatigue syndrome: A high serum concentration of transforming growth factor (TGF)‐β has been reported to be present in the majority of patients with CFS (Bennett et al., 1997), and TGF‐β is known to inhibit the production of dehydroepiandrosterone sulfate (Stankovic et al., 1994), which positively regulates the activity of carnitine acetyltransferase, the enzyme that catalyzes the transfer of free carnitine to acylcarnitine, and especially acetylcarnitine (Chiu et al., 1997).