is jay cutlers l carnitine safe New research says L-carnitine might do more than you think. It can help with recovery after your workouts—not just fat metabolism like most people assume. Watch Liquid L-Carnitine 3000: Metabolism &
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However, the handful of studies available is promising

Raju M, Varakumar S, Lakshminarayana R, Krishnakantha TP, Baskaran V
Therefore, one of the tactics in maintaining the viability of neurons in conditions of neurodegeneration is the preservation of astrocytic function, which will be key for the survival of neurons
Polymeric nanoparticles deliver the drug to a specific site and deliver the drug at a specific amount, which is valuable for the treatment of various diseases (Sur et al., 2019)

For most adults under 50, this means 200 to 300 ng/mL
Plochl, E., Sperl, W., Wermuth, B., and Colombo, J