Deer Blood
Encyclopedia
Deer blood is used as a healthful nutritional supplement in some parts of the world, particularly in East Asia
East Asia
East Asia or Eastern Asia is a subregion of Asia that can be defined in either geographical or cultural terms...

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It is often freeze dried to preserve it's viability as an ingestible substance, after it is sterilized to eradicate biological health threats (such as bacterial infection and parasites that may reside in the blood while the deer is alive).

Freeze dried deer blood is a dark red powder with a high iron content, and is high in protein
Protein
Proteins are biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form, facilitating a biological function. A polypeptide is a single linear polymer chain of amino acids bonded together by peptide bonds between the carboxyl and amino groups of...

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Sources

In the Eastern Hemisphere, Deer Blood is sold as a commercial product.

In the Western Hemisphere, it is reported that some hunters drink the blood of the first deer they ever kill (such an instance was popularized in the 1984 American film: Red Dawn
Red Dawn
Red Dawn is a 1984 American war film directed by John Milius and co-written by Milius and Kevin Reynolds. It stars Patrick Swayze, C. Thomas Howell, Lea Thompson, Charlie Sheen and Jennifer Grey....

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In reality, raw deer blood, as encountered in a freshly slain deer, often contains dangerous parasites and other pathogen
Pathogen
A pathogen gignomai "I give birth to") or infectious agent — colloquially, a germ — is a microbe or microorganism such as a virus, bacterium, prion, or fungus that causes disease in its animal or plant host...

s. The practice of drinking fresh deer blood is largely considered mythical due to the very real risks inherent in the practice.
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