l carnitine vs l arginine L-Carnitine L-Arginine: Understanding Their Differences and Benefit – Fitness Health L-Carnitine vs L-Arginine for Erectile
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doi:10.1016/j.ypmed.2016.01.022 Neglia, Danilo et al

It is generally not present in plant foods, but can be fortified in certain foods, such as breakfast cereal
Therefore, in this case, females would not be appropriate to test our hypothesis

Dyer AH, Vahdatpour C, Sanfeliu A, Tropea D (2016) The role of insulin-like Growth factor 1 (IGF-1) in brain development, maturation and neuroplasticity