l-carnitine fish smell L-Carnitine: Benefits, Uses, and Side Effects how to avoid fishy smell
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10.1002/ana.10784

A randomized, double-blind, placebo-controlled trial in 28 older women (ages, 65-70 years) found no effect of L-carnitine supplementation (1.5 g/day for 24 weeks) on serum pro-inflammatory cytokine concentrations, body mass and composition (lean [fat-free] mass and skeletal muscle mass), or measures of skeletal muscle strength (123)
Baci D, Bruno A, Bassani B, Tramacere M, Mortara L, Albini A, Noonan DM

It's at the front of your neck, under your skin

A study of plasma and urinary levels of free carnitine and short-chain acyl-carnitines in surgical patients showed that the septic state was associated with increased urinary excretion of free carnitine and lower plasma levels of short-chain acyl-carnitines [101]