I get about 7000% of beta carotene almost daily. I get retinol from about 4 ounces of liver once a week. I know vitamin a (retinol) can be overdosed but can beta carotene be overdosed too?
Google gave me mixed answers.
No, you can't. Body doesn't convert it to A if it doesn't needed. You can get orange but that is cosmetic problem.
Absorption efficiency is estimated to be between 9-22%. The absorption and conversion of carotenoids may depend on the form that the β-carotene is in (cooked vs. raw vegetables, in a supplement), intake of fats and oils at the same time, and current stores of vitamin A and β-carotene in the body
β-Carotene can be stored in the liver and body fat and converted to retinal as needed, thus making it a form of vitamin A for humans and some other mammals.
I was eating 1kg carrots per day when I had mononucleosis at age 16. That is the only thing that was able to cure me and doctors were puzzled. Alpha says it > 3000% of daily requirements.
I've never seen any evidence that it's dangerous, aside from the aesthetic downsides. I used to consume 500g+ of carrots per day, plus lots of tomatoes and I had only the slightest detectable glow to my skin (you'd only think it was from the food if you were looking for it), but people did ask me how my skin constantly looked healthy even though I notoriously never went out in the sun (being nocturnal at the time).
If you ate almost exclusively sweet potato, you'd get around 10,000%, so I figure that this amount can't be too harmful, given that some healthy cultures do eat lots of sweet potato.
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