l carnitina vitafor L-Carnitina + B6 120 Cápsulas Spring Valley L Carnitine Amino
Description
In the UK, some labs set the lower limit at around 150-200 pg/mL

It occurs naturally in protein-rich foods such as meat, fish, and legumes

10.1016/j.neuint.2012.05.013 Neurochem Int

Zinc ions compete with copper for certain cellular pathways