@forty said in Why Biotin deficiencies are considered "rare"?:
I've been wondering this for a few months now lol. If you actually track your biotin intake you're probably deficient unless you eat 3 eggs or liver every day. Cooking egg whites makes it much less effective at binding to biotin, although precisely how much I'm not sure.
One thing to note is that coffee, and presumably espresso even more so (since its nutrients are about 1.274x more concentrated than coffee), has very significant amounts of biotin that aren't included in most food databases: https://plaza.umin.ac.jp/~e-jabs/2/2.109.pdf but I'm not sure how to calculate exactly how much biotin is in a given amount of coffee; the paper is quite confusing. If someone could work out the numbers that would be excellent.
"''Biotin content table', based on the combination of published data in Japan and foreign countries. Of these, the biotin contents of some foods such as peanuts, red peppers, liver (cattle, swine, and chicken), kidney (cattle), eggs (yolk), instant coffee, baker's yeast (dried), and royaljelly were over 50 µg/100g per food."
edit: this page claims 88.4 mcg per 100g instant coffee: https://wholefoodcatalog.info/nutrient/vitamin_b7(biotin)/foods/high/
Interesting. It still hard to get the RDA 30mcg knowing that not everyday you eat liver, milk doesn't have any and one coffee contains around 3g of instant coffee, maybe the espresso has more, but still. Eggs inhibit biotin absorption.
It's weird how nobody talks about biotin. It seems that mainstream sees it as a vitamin only for nails and hair growth.