Is 3,000-4,500 mg of Desiccated Grassfed Beef a good dose for people to use to benefit from the content of vitamin A and other nutrients?

This would be adequate for most people in taking it daily, or twice a week with divine augmentation through daily prayers requesting blessing for things ingested. If you look at the nutritional benefits of liver, you will see there are number of especially rich and valuable nutritional components in beef liver that will augment the diet for humans as well as companion animals quite nicely.