Quoting this from a smart individual from another site:
There's no reason to believe tartrate is ergogenic. It's addition to carnitine does improve carnitine uptake though. Increasing muscle carnitine via LCLT improves the rate of FA transport into the mitochondrial matrix, thus leading to more rapid ATP formation via b-oxidation and less purinergic degradation via hypoxanthine dumping, which occurs in response to high cellular AMP. This is how LCLT is:
1. Ergogenic
2. Cell-protective (xanthine oxidase creates ROS in detoxifying xanthine to uric acid...to make matters worse, it also acts on hypoxanthine -> xanthine, so you get a double whammy for each molecule of hypoxanthine)
3. Able to improve the VO2 max (hypoxia is also a trigger for hypoxanthine dumping)










