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Rotate between two or three sites within the general shoulder region to prevent local tissue irritation

For example, mutations in the IVD gene encoding the enzyme for leucine degradation cause isovaleric acidemia, in which the intermediate isovaleric acid accumulates and damages the brain and nervous system (Vockley and Ensenauer, 2006)

If needed, sonication (brief exposure to ultrasonic waves) can help dissolve stubborn peptides

Reported effects are mild and transient: Localized irritation or redness at injection site, Mild fatigue or transient headache during initial days, Rare gastrointestinal upset (nausea, stomach discomfort)