US$ 28.14
difference between l-carnitine and carnitine How to Analyze Acylcarnitine? Difference between L-Carnitine Tartrate and
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Seems to work for me but who knows - might be psychological

Harker KS, Ueno N, Lodoen MB

These can be marketed for brain health or focus. Still, the FDA does not approve them to treat any medical condition (meaning manufacturers cannot legally claim, for example, that a supplement cures ADHD or Alzheimers)

doi: 10.1007/s00394-017-1445-8 53