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It’s recommended that you take zinc by mouth.

It is from this article. What I think the author means by that is taking zink orally, but Although I am not a native, the use of by mouth feels akward to me. Perhaps it had a different meaning I am not aware of.

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    They went by foot and played it by ear. They like to do things by hand. – Tᴚoɯɐuo Dec 13 '18 at 14:11
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Yes, you are correct:

orally adverb (by mouth)

dictionary.cambridge.org

  • BY MOUTH (adverb)
    The adverb BY MOUTH has 1 sense:

    1. (of drugs) through the mouth rather than through injection

    Familiarity information: BY MOUTH used as an adverb is very rare.

https://www.audioenglish.org

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    If you are going to have a general anaesthetic in a British hospital, and you must not eat or drink anything, a notice proclaiming "Nil by mouth" will be attached to your bed, and you may be asked to wear a bracelet with those words on it. – Michael Harvey Dec 13 '18 at 12:55
  • In the US you might also see NPO (for nil | nihil | nulla per os). – Tᴚoɯɐuo Dec 13 '18 at 14:13

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