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One celebrity doctor in my country says that Vitamin D can be absorbed only in the small intestine and that dropping Vitamin D drops on your tongue is therefore useless, because most of the liquid will never reach your small intestine. He suggests that people use vitamin D only in pill form, so that the pill will have time to travel through your stomach.

Yet, the bottle of my vitamin D drops explicitly says that the drops should be dripped on the tongue.

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  • See the comment I posted on your other question today. Needs prior research.
    – Carey Gregory
    May 12 '20 at 18:58
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    @CareyGregory Thank you! I will be back after having done more research. May 12 '20 at 19:11
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    @CareyGregory: frankly this q seems reasonably well researched for a question: expert? claim, counter-checked against a possibly reasonable/common information source (although it's unclear if the packaging was from a more reputable medication company or some--possibly more obscure supplements--company). Anymore research and one basically ends up writing the answer themselves.
    – Fizz
    May 13 '20 at 13:04
  • @CareyGregory: also, e.g. FAQ from Yale on vit D doesn't address this particular issue, so it's not common one discussed.
    – Fizz
    May 13 '20 at 13:20
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    @Fizz A "celebrity doctor" equates to someone like Dr. Oz in my mind. And the packaging of an unknown product could be anything, as you noted.
    – Carey Gregory
    May 13 '20 at 14:15
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It appears that Vitamin D oil drops are just as effective as tablets. Well they have the oil which helps the Vitamin D absorb since D is fat soluble I guess. https://vitamindwiki.com/tiki-download_wiki_attachment.php?attId=13764&download=y

We compared the effectiveness of tablets versus oil in raising S-25-hydroxyvitaminD(S-25-OHD) in plasma by re-analyzing data from a previously performed observational study in which immunodeficient patients with S-25-OHD concentrations <75 nmol/L were randomly prescribed vitamin D tablets (1600 IU/day) or vitamin D oil-drops (1500 IU/day) for twelve months. Tablets and oil were compared for the effect on S-25-OHD concentrations after 3–5 months and antibiotic use. Results: Data on S-25-OHD after 3 months was available for 137 patients treated with tablets and 69 with oil drops. Both groups exhibited a significant increase in S-25-OHD—oil-drops from 55 to 86 nmol/L and tablets from 52 to 87 nmol/L—with no difference between groups (p = 0.77).

"Are Vitamin D Tablets and Oil Drops Equally Eective in Raising S-25-Hydroxyvitamin D Concentrations? A Post-Hoc Analysis of an Observational Study on Immunodeficient Patients", Nutrients, published April, 2020.

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    Also from a 2017 review adding vitamin D to a fat matrix worked better bioavailability-wise than e.g. adding it to a protein matrix.
    – Fizz
    May 13 '20 at 13:14
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    Likewise a 2018 systematic review.
    – Fizz
    May 13 '20 at 13:23

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