From the comments, it is clear that American people do not know about blood and bone. For gardens, that is.
Blood & Bone is a natural, organic fertiliser, available in bags from supermarkets and gardening shops. When we first moved to this house 10 years ago the soil in our garden was so depleted and powdery dry that every week when I did the supermarket shopping, I would toss a bag of blood & bone, or cow manure (also available at my local supermarket, happily) into the trolley. It became a weekly thing to throw onto the garden and after about two years I had lovely rich dark loam. Except for that dry bit under the paperbark that is doomed to remain dry and powdery and not grow anything except euphorbias.
Don't ask me whose blood and bone is in the bag, as this is a question I do not wish to know the answer to. I suspect it's elderly cows or racehorses. But really, it's best not to dwell. Are you ready with me ...? Stick your fingers in your ears and sing La la la la, La la la la. Loudly.