A careful reading of the label shows that Catalyn® contains vitamin isolates as the primary source of each of the claimed nutrients.
While Catalyn® does contain carrots, that is not the source of the 1200 IU of vitamin A. The label shows that Catalyn® contains the USP isolate vitamin A palmitate, which is presumably where most, if not all, the 1200 of vitamin A comes from (carrots provide betacarotene, not palmitate).
Catalyn® contains USP ascorbic acid, which is presumably the source of the 4 mg of vitamin C. It may be of interest to note that the original founder of Standard Process, Dr. Royal Lee, did not want people to call ascorbic acid vitamin C:
Dr. Lee felt it was not honest to use the name ‘vitamin C’ for ascorbic acid. That term ‘should be reserved for the vitamin C COMPLEX’ (DeCava, J. The Lee Philosophy-Part II. Nutrition News and Views 2003;7(1):1-6).
Catalyn® contains USP cholocaliferol which is presumably the source of its vitamin D. Dr. Royal Lee once opined:
“The synthetic forms of vitamin D have been found to be toxic” (Lee R. Vitamin D Complex. Lee Foundation for Nutritional Research, Milwaukee, circa 1950).
Catalyn® contains USP thiamine hydrochloride which is presumably the source of its thiamine.
This seems strange as Dr. Royal Lee specifically wrote against isolated and synthetic forms of vitamins, but they are in Catalyn® (Lee R. How and Why are Synthetic Poisons Sold as Iimitations of Natural Foods and Drugs, 1948).
Thiamine hydrochloride is not what is naturally found in food and it is not a food, but a USP isolate.