As the strongest antioxidant, natural astaxanthin has a lot of health benefits, however some people are not recommended to use natural astaxanthin, please see the applicable group and inapplicable group listed below: Applicable group 1) People with painful diseases: rheumatoid arthritis, rheumatoid arthritis, gout, bursitis, synovitis, knee arthritis, etc. 2) People with diabetes and its complications: [...]