EDIT: …Well I messed this thread up. I wasn’t referring to biological half life, but sitting-on-your-shelf half life. (i.e. expiry)
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The pharmaceutical Half life of a chemical is used to determine the dosing schedule for best desired effect and least amount of unwanted side effects.
It’s part of how they determine that you should take 2 ibuprofen every 6 hours vs every 2 hours.
Most other things we put in our bodies, aren’t attached to a dosing schedule per-say so no one has bothered to figure out the half life of the chemicals involved.
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