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Benefits from CoQ10 and L-carnitine supplementation typically require several weeks to months of consistent use to become apparent

Transl Androl Urol 2016;5(3):296-302

According to the Exceptions to this are people who have a medical reason to take a supplement, such as people who are pregnant or have a specific medical condition

Several studies have shown L-carnitine and ALCAR can improve energy status, decrease oxidative stress, and prevent subsequent death in adults and brain surgery

Prog Neurobiol 106107:1732

L-Carnitine is not an instant transformation agent