pros and cons of taking l carnitine L-Carnitine Carnitine: the claims and why
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Wang C.-K

2022, doi:10.1371/journal.pone.0273186 Georgakopoulou, Vasiliki Epameinondas et al

These findings underscore the complex role of iron in shaping effective T-cell responses as it regulates activation, proliferation, lineage stability and immune homeostasis

It seems you may need high B12 supplementation and to stop any folate supplements for a while
