l-Carnitine l-tartrate supplementation favorably affects biochemical markers of recovery from physical exertion in middle-aged men and women - Ho, J Y; Kraemer, W J; Volek, J S; Fragala, M S; Thomas, G A; Dunn-Lewis, C; Coday, M; Hakkinen, K; Maresh, C M (Metabolism, 2010)