Certified GKH Gardening Expert
Blood meal, which is essentially dried blood, is used often in the garden as a fertilizer for adding nitrogen to the soil (https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/blood-meal-fertilizer.htm), so using it is helpful in the garden).
There is one thing to consider though. With blood meal, you can have issues with animals being attracted by the scent and rooting around where the blood meal is spread.
The following article should also be of some help to you: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/nitrogen-plant-fertilizer.htm