But vegetarians be aware; retinol, or vitamin A1, is only found in animal-sourced foods like cheese, liver, butter, and fish.

4. Liver. Calling it like we see it: a single slice of beef liver contains 6,421 mcg of vitamin A1, which is 713 percent (!) of the daily value.

Calling it like we see it: a single slice of beef liver contains 6,421 mcg of vitamin A1, which is 713 percent (!) of the daily value. 5. Winter squash.

Vitamin A1, also known as retinol, is only found in animal-sourced foods, such as oily fish, liver, cheese, and butter. Here are some of the best sources of vitamin A1. 1.

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The antioxidant vitamin A comes in three different forms, the best-known being retinol (vitamin A1). You’ll find high levels of vitamin A in foods like: Carrots ...

The study uses Mendelian randomization to examine the relationship between 14 micronutrients and 22 cancer outcomes, finding significant associations between higher magnesium and vitamin B12 ...