**5. Conclusions**

Although in the presented intervention study an initial decline of 25(OH)D blood level was observed (probably connected to the starting time of the study), afterward the daily salmon intake contributed to its increase. Based on the observed results, it may be stated that the baseline 25(OH)D status is an important determinant of the intervention e ffectiveness during the autumn season, as it is more e ffective in participants with inadequate vitamin D status. It may be concluded that an increase in farmed Atlantic salmon intake may be a good way to improve vitamin D status, especially in vitamin D-deficient individuals.

**Author Contributions:** D.G. made conception; Z.U. and D.G. performed the research; Z.U. and D.G. analyzed the data; and Z.U. and D.G. wrote the paper. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Polish Ministry of Science and Higher Education within funds of the Institute of Human Nutrition Sciences, Warsaw University of Life Sciences (WULS), for scientific research. The experiment was financed by Suempol Polska Ltd.

**Conflicts of Interest:** The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results. None of the authors declare any conflict of interest.
