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The science on this subject is quite clear

Shen C.-T
Elhag DA, Kumar M, Saadaoui M, Akobeng AK, Al-Mudahka F, Elawad M, et al

Plant Sources: While L-Carnitine is primarily found in animal products, certain plant-based foods, like avocados and soybeans, may contain minimal amounts

doi: 10.3389/fimmu.2016.00097 24 ZhangHZhouLYuenJBirknerNLeppertVODayPAet al

The modified molecule may be a protein, peptide, or non-peptide molecule and one or more PEG chains can be attached
