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Alternatively, duloxetine had the greatest improvement in pain and depression [35]

Carbohydrates in general stimulate the release of insulin, which can help to increase the uptake of amino acids, including L-carnitine, into the muscle cells

Altay, O., Arif, M., Li, X., Yang, H., Aydn, M., Alkurt, G., Kim, W., Akyol, D., Zhang, C., DinlerDoganay, G., Turkez, H., Shoaie, S., Nielsen, J., Born, J., Olmuscelik, O., Doganay, L., Uhln, M., & Mardinoglu, A

Stoppani also notes it's often best taken with food especially a meal containing carbs since research suggests carbs can help drive uptake into muscle
