To recognize the beneficial effect of astaxanthin on health, which of the following evidence is the best?

A、Astaxanthin inhibits tumor cell growth;

B、Epidemiological investigation shows that people who take astaxanthin rich foods have lower blood lipid levels;

C、Astaxanthin inhibits Helicobacter pylori growth in mice digestive tract;

D、Skin elasticity is better in the middle age women who took astaxanthin 2mg/per day for 6 consecutive weeks than that of women taking placebo