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Description
The process involves more steps than preparing an injectable solution but uses similar principles

Solution: Use at least 250mcg per injection

Sure enough, at the 3.5 hour mark, I felt the cold, numb feeling (not a normal headache feeling) on the right side of my head/scalp

With a half-life of approximately five days, you can calculate clearance using the standard pharmacokinetic model
10.1002/hep.26319 Hepatology

Intramuscular Injection: Injecting directly into the muscle, sometimes near the site of an injury to potentially concentrate its healing effects locally