where does l-carnitine come from Role of carnitine in disease | Nutrition & Metabolism JYM L-Carnitine L-Tartrate
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Comparison of cytotoxicity of SIH and BSIH Inherent cytotoxicities of the chelator SIH and its derived prochelator BSIH were firstly determined following their 24 h incubations with differentiated PC12 cells in a concentration range from 3 to 600 M (solubility limit)

This suggests that targeting GDH2 could be a beneficial strategy for treating patients with IDH1 mutant gliomas
If you decide to combine them, consistency is more important than high doses

Methods of assessment of copper status in humans: a systematic review

doi: 10.1016/j.foodchem.2020.127915
