can you name some of the natural products?
Plants, animals, algae, fungi or lichens, including such examples as ginkgo biloba, curcumin, cranberry, St. John’s wort, ginseng, resveratrol, glucosamine and collagen.
Dietary supplement
plants, animals, algae, fungi or lichens, including such examples as ginkgo biloba, curcumin, cranberry, St. John’s wort, ginseng, resveratrol, glucosamine and collagen. 
what is manta ray? Large rays belonging to the genus "Mobula" what kind of creatures are they? They are classified among the Myliobatiformes (stingrays and relatives) and are placed in the family Myliobatidae (eagle rays). is it a kind of fish? No, they are large rays. where do they live? They are found in warm temperate, subtropical and tropical waters. how do they look like? They have broad heads, triangular pectoral fins, and horn-shaped cephalic fins located on either side of their mouths. They have horizontally flattened bodies with eyes on the sides of their heads. what impact does it create in tourism industry? Sites at which manta rays congregate attract tourists, and manta viewing generates substantial annual revenue for local communities. any specific region where they are widely seen? Indo-Pacific and tropical east Atlantic what is food habits like? They consume large quantities of zooplankton in the form of shrimp, krill, and planktonic crabs. In deeper depths, mantas consume small to medium-sized fish. what is the second one? Krill are small crustaceans of the order Euphausiacea. can humans consume it too? Krill are under development in the early 21st century as human food, dietary supplements as oil capsules, livestock food, and pet food. why are the supplements used by humans? A supplement can provide nutrients either extracted from food sources or synthetic, individually or in combination, in order to increase the quantity of their consumption.
wiki:25288309
Dietary supplement [SEP] Natural products
Dietary supplements can be manufactured using intact sources or extracts from plants, animals, algae, fungi or lichens, including such examples as ginkgo biloba, curcumin, cranberry, St. John's wort, ginseng, resveratrol, glucosamine and collagen. Products bearing promotional claims of health benefits are sold without requiring a prescription in pharmacies, supermarkets, specialist shops, military commissaries, buyers clubs, direct selling organizations, and the internet. While most of these products have a long history of use in herbalism and various forms of traditional medicine, concerns exist about their actual efficacy, safety and consistency of quality. Canada has published a manufacturer and consumer guide describing quality, licensing, standards, identities, and common contaminants of natural products.