Anyone tried L-Carnitine

I've found a few places recommending l-carnitine, such as this one:
https://www.emf-portal.org/en/article/17375

Has anyone tried it? I will try it soon. That article is interesting as it says it protects loss of vitamins.
"L-carnithine and selenium seemed to have protective effects on the 2.45 GHz induced decrease of vitamins."

I haven't but what helps me are magnesium and potassium.