Astaxanthin is one of nature's most powerful antioxidants with free radical scavenging strength as much as 65 times greater than vitamin C and 54 times greater than beta-carotene. Mercola Astaxanthin with ALA:

• Supports your brain and nervous system protection from free radicals*
• Supports your joint and skeletal system health*
• Increases your strength and stamina*
• Improves your endurance and enables faster recovery from exercise*
• Helps reduce your joint and muscle soreness following a workout*

ALA is present in the formula because it is an omega-3 fatty acid that can act as an excellent "carrier" for astaxanthin... to help you maximize absorption.