is l carnitine harmful 4 Benefits of L-Carnitine for Your Heart and Brain Health Acetyl-L-Carnitine, 500 mg, 200 Veg
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Rosa et al., 2010)

Effects of prolonged whey protein supplementation and resistance training on biomarkers of vitamin B12 status: a 1-year randomized intervention in healthy older adults (the CALM study)

Journal of Anti Aging Medicine, 2001

Both forms, however, increase mitochondrial energy production and power up energy-starved brain cells

While the results are promising, a lot of evidence is anecdotal or from animal studies
