I can compile a comprehensive list of NRVs (Nutrient Reference Values) for the specified ingredients in the countries you've mentioned. I'll meticulously research and gather the NRVs for Vitamin D, Vitamin B6, Vitamin D3, Zinc, and Selenium in Italy, Germany, France, Spain, Switzerland, UK, Austria, Netherlands, Belgium, Portugal, Poland, and Sweden. Rest assured, the information provided will be accurate and up-to-date, ensuring compliance with regulatory standards for marketing your Food Supplement across these regions. If you have any additional preferences or specific criteria, please feel free to share, and I'll tailor the list accordingly to meet your requirements.