Hi doc where come from a vitamin?

Veggies, dairy &...: Pre-formed vitamin a is only found in animal foods, esp. Dairy, eggs & seafood, but most people get vitamin a from eating foods rich in carotenoids, which we convert to vit.A- the best sources are sweet potato, carrots, spinach, kale & othe dark leafy greens, winter squash, cantaloupe, papaya, peppers & tomatoes- see http://www.Whfoods.Com/genpage.Php?Tname=nutrient&dbid=106.