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is l carnitine only from animals Systemic regulation of L-carnitine in nutritional metabolism in zebrafish, Danio rerio L-Carnitine | Linus Pauling Institute
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doi:10.1007/s11055-016-0377-8 31

They have supplemented this formulation to male participants of a clinical trial of this drug for 2 to 5 months at a daily dose of 2 capsules before their semen has taken for IVF and intra-cytoplasmic sperm injection (ICSI)

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However, you cant do it on your own

(5) Improving male fertility: L-carnitine has been found to improve sperm quality and increase testosterone levels in men

The richest dietary sources of carnitine are red meats, fish, poultry, and dairy products
