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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I mean, you could theoretically calculate the half-life for any substance that you put in your body. It might be difficult, but it’s possible.
Half-life in a pharmaceutical context just means “the amount of time for half of a substance to be eliminated from the body.” Given that you don’t eat rocks, it doesn’t make sense for us to develop a half-life for them. If the body can’t eliminate the mineral, it’s possible the half-life wouldn’t even exist.
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