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A peptide is a chain of amino acids held together by peptide bonds, and those bonds are precisely what digestive enzymes (pepsin, trypsin) are built to cut, with the acidic stomach environment finishing the job so an oral peptide is largely destroyed before it can be absorbed, which is why injection is the default
However, it is not FDA-approved for medical treatment or injection, and regulatory status may vary by use
Injections using a 5/8 (1.5cm) needle are inserted at a 45-degree angle
A few people notice temporary soreness at the injection site or mild flushing that fades quickly
The mechanism appears to be interference with erythropoiesis
It is naturally found in foods such as meat, fish, and dairy
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