A transport role in energy metabolism
Carnitine is involved in transporting long-chain fatty acids into mitochondria so they can be oxidized. Acetyl-L-carnitine is one form of carnitine and has also been studied in relation to nervous-system and metabolic questions. The NIH Office of Dietary Supplements explains that healthy people generally make enough carnitine themselves and do not need to obtain it from food or supplements to meet basic requirements.
Advanced Mitochondrial Formula's public label transcription lists 190 mg of acetyl-L-carnitine per two-capsule serving. That amount should be read in the context of the complete formula and the person's health history, rather than assumed to correct a deficiency or increase stamina.
What the research question should be
Studies of carnitine forms have been conducted in specific groups and for specific outcomes. The results cannot automatically be applied to every person who feels tired. If a study uses a different form, much higher dose, or particular clinical population, those differences limit what can be concluded about this product.
Safety and individual factors
The NIH fact sheet notes that high supplemental carnitine intakes, around 3 grams per day, can cause gastrointestinal symptoms and a fishy body odor; it also discusses concerns for people with certain health conditions and possible medication interactions. This is much higher than the amount in the label transcription, but the comparison does not prove that any dose is appropriate for everyone.
Bring the current label and medication list to a pharmacist or healthcare professional if you are considering the formula, especially if you have a seizure disorder, kidney-related health issues, or take regular prescription medicines.