Yes, unequivocally, if your fatigue is caused by a diagnosed B12 deficiency
Exploratory biomarker findings were variable, and the authors called for additional studies on dose and effectiveness beyond 30 days
& Henderson, A
L-carnitine supplementation enhances blood flow and oxygen supply to the muscle tissue and may help reduce the buildup of lactic acid in the muscles, which can contribute to muscle fatigue
Glutathione for skin lightening: a review of efficacy, safety, and clinical evidence
In addition, this enzyme was also found in the nucleolus of various cell types, such as human HeLa cells, mouse L929 cells (fibroblast cell line), but also in mouse testes, specifically in spermatogonia, spermatocytes and spermatids