Beta-carotene has many health functions on its own for the human body, besides being converted into vitamin A. Moreover, beta-carotene does not have the problem of poisoning caused by overdose.　

Beta-carotene has the function of improving the body's immunity. It can quench free radicals, promote the enhancement of immune function, can protect phagocytes from oxidative damage caused by free radicals, promote the proliferation of T.B lymphocytes, stimulate the function of T-cells, improve their killing ability.　

Beta-carotene has the ability to inhibit the occurrence and growth of cancer cells, the United States Harvard University conducted a 10-year study, proved that beta-carotene not only has the function of cancer prevention and suppression of cancer, but also on the prevention of heart disease has a certain effect.　

Experiments have also shown that natural β-carotene has a stronger antioxidant and free radical quenching ability than synthetic β-carotene, the reason is that microalgae naturally produces β-carotene in the 9-cis structure of the proportion of (40%) than the proportion of synthetic ((4%) to be much higher.

Therefore, natural carotenoids have better therapeutic and health care functions. Green A?