For the marigold is a marigold, annual herb. Origin in Mexico, currently in China's Heilongjiang, Jilin, Inner Mongolia, Xinjiang, Yunnan and other places have large-scale cultivation.
We produce all raw materials used in marigold planting base from Xinjiang. Endemic soil and light conditions, making Marigold with fast growth, long flowering period, high yield and good quality, ensure a steady supply of raw materials, production of high yield, low production costs.
There currently is no Recommended Dietary Allowance (RDA) or Recommended Daily Intake (RDI) for lutein or zeaxanthin, but some experts say you should ingest at least 6 milligrams (mg) of lutein per day for beneficial effects.
It remains unclear how much lutein and zeaxanthin is needed daily for adequate eye and vision protection. Also, it is unknown at this time whether supplements have the same effect as lutein and zeaxanthin obtained through food sources.
There are no known toxic side effects of taking too much lutein or zeaxanthin. In some cases, people who eat large amounts of carrots or yellow and green citrus fruits can develop a harmless yellowing of the skin called carotenemia. Though the appearance of the condition can be somewhat alarming and may be confused with jaundice, the yellow discoloration disappears by cutting back on consumption of these carotenoid-rich foods. (Carotenemia also can be associated with over-consumption of carotenoid-rich nutritional supplements.)