l-acetyl carnitine cipn NOW Foods Supplements, Acetyl-L-Carnitine 750 mg, Amino Acid, Brain And Nerve Cell Function*, 90 Tablets : Health & Household Acetyl-L-carnitine – Cellular energy –

While L-carnitine supplementation normalized plasma carnitine concentration in vegetarians to that observed in omnivores, there was no effect on energy metabolism and physical performance compared to no supplementation and between vegetarians and omnivores (131)

It is safe, it is legal at most available oral doses and some fairly solid science says it can boost performance if taken the right way over the right period of time

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Cell Stress Chaperones 24 , 661673 (2019)

Effects of tea type and method of preparation

Heptanoate as a neural fuel: energetic and neurotransmitter precursors in normal and glucose transporter I-deficient (G1D) brain