l-carnitine side benefits The bright and the dark sides of supplementation: a systematic review | Journal of the International Society of Sports Nutrition L-Carnitine: Benefits, Side Effects, And

Hierarchical clustering of subjects was performed using the hclust R function on the log2-transformed lipid concentrations

[88] Enhancing performance Cognitive performance In 2015, a systematic review and a meta-analysis of high quality clinical trials found that, when used at low (therapeutic) doses, amphetamine produces modest yet unambiguous improvements in cognition, including working memory, long-term episodic memory, inhibitory control, and some aspects of attention, in normal healthy adults

A study involving hypothyroid patients showed that borderline-to-low B12 levels were more frequent in both overt and subclinical hypothyroidism groups compared with controls [95]

Therefore, further studies are required in this regrade