I've been using it every day for the past 4 years.
It's an excellent antioxidant. In my opinion, it's one of the most underated supplements on the market.
ALA directly recycles vitamin C and indirectly recycles vitamin E. Increases glutathione levels in cells, in part by improving the body's ability to use the amino acid L-cysteine to synthesize its supply of glutathione. Enhanses the utilization and disposal of glucose, helps to protect the brain (the most sensitive organ to free radical damage) and the eyes.
Many other health benefits as well.