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[DOI] [PMC free article] [PubMed] [Google Scholar] 108.Fu LJ, Chen SB, Han LS, Guo Y, Zhao PJ, Zhu M, Li F, Huang MR

2010 Oct;42(10):1809-18
Superiority of L-propionylcarnitine vs L-carnitine in improving walking capacity in patients with peripheral vascular disease: an acute, intravenous, double-blind, cross-over study
10.1186/1741-7015-10-91 [DOI] [PMC free article] [PubMed] [Google Scholar] Berk M., Dean O

That means its FDA-approved for a separate health condition but has uses that make it effective for other ends