The chemical formula for beta-carotene is C40H56
C40H56 + O2 + 4H-----> 2C20H30O (beta-carotene) (vitamin A)
This compound is beta-carotene.
Carotene is responsible for the orange colour of carrots. There are many other vegetables that contain Beta Carotene.
The formula for carotene can be found on Wikipedia, which lists it as C40Hx and mentions the different kinds of carotene in existence, mainly alpha and beta.
Carrots
Beta Carotene can appear yellow, orange, or brown depending on its concentration. A dilute mixture of beta carotene will appear yellow as there isn't enough of it to absorb the extra light needed to make it appear orange.
...Carrots. Hence the name.
beta carotene
Beta carotene is important for proper eye nutrition.
Not exactly. The body will convert Beta Carotene into Vitamin A when it is needed. That's why Beta Carotene is the preferred and safer version of Vitamin A... you can overdose on pure Vitamin A easier than you can on Beta Carotene
There are many animals types that contain beta-carotene. Shrimp do have beta carotene, along with many types of algae.
Natural Beta-carotene is used in health care in two ways: As Pro -Vitamin A, which is due to its ability to be converted to Vitamin A as and when the body requires, and as an antioxidant, which protects against cell and tissue damage by scavenging free radicals. This dual function of Natural Beta-carotene is due to the presence of Cis and Trans Beta-carotene isomers. Synthetic Beta-Carotene has only All-trans Beta-carotene. This inherent disadvantage of synthetic Beta-carotene has led many users to use Dunaliella, which is the best source of Natural Beta-Carotene with a high Cis-Trans Beta-carotene ratio (25:75).