Vitamin DView our top pick ↗
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Editorial team

The people behind
the guidance.

Vitamin D can raise a lot of questions. We’re here to make the answers clearer, from the food you eat to the label on a bottle.

Our approach is to explain what is known, show where uncertainty remains, and keep practical advice in context. Get to know the people contributing to our vitamin D education, or read about our editorial approach.

Zeynep Özdemir, RD

Registered Dietitian · Editorial lead

Zeynep Özdemir, RD

Zeynep is a registered dietitian based in Ireland and Nutritionn’s in-house nutrition expert. She studied Nutrition and Dietetics at Ege University. Her professional background spans sports nutrition, gut health, micronutrient science, supplement evaluation, and food safety.

She founded Nutrihome Academy and Homenutrition Journal, a quarterly nutrition publication. Alongside her dietetics training, she holds qualifications in sports nutrition, the gut–brain connection, and food safety management. On this site, she helps shape clear explanations of vitamin D intake, food sources, supplements, and the questions readers bring to the evidence.

Credentials & professional background

Education

  • BSc in Nutrition and Dietetics, Ege University, Türkiye
  • Registered Dietitian (RD)

Professional development

  • Sports Nutrition Specialist (SNS)
  • Gut-Brain Connection Diploma
  • ISO 22000:2018 Food Safety Management Systems, Internal Auditor
  • Food safety training: HACCP, BRC, FSSC 22000, and GHP

Affiliations

  • Turkish Association of Dietitians (TDD), member
  • European Society for Clinical Nutrition and Metabolism (ESPEN), member

Initiatives

  • Nutrihome Academy, founder
  • Homenutrition Journal, founder

Daily intake & food sources · Supplement labels · Evidence in context

Read the vitamin D guide
Sevimnur Tas, RD

Registered Dietitian · Nutrition educator

Sevimnur Tas, RD

Sevimnur is a registered dietitian and Pilates instructor based in Türkiye. A graduate of Muğla Sıtkı Koçman University, she has worked across clinical dietetics, nutrition consultancy in the fitness industry, and sports instruction.

At Nutritionn, she contributes to nutrition education and content development as a dietitian and sports instructor. Her dietetics education is complemented by Pilates Instructor Level 1 and 2 training and ISO 22000 food safety management certification. For our vitamin D education, her focus is on making topics such as food choices, product labels, and everyday routines practical and understandable.

Credentials & professional background

Education

  • BSc in Nutrition and Dietetics, Muğla Sıtkı Koçman University, Türkiye
  • Registered Dietitian (RD)

Professional development

  • Pilates Instructor, Levels 1 and 2
  • ISO 22000 Food Safety Management System certification

Experience

  • Clinical dietetics
  • Nutrition consultancy in the fitness industry
  • Pilates and sports instruction

Affiliations

  • Dietitian and Sports Instructor, Nutritionn
  • Contributor, Nutrihome Academy

Everyday food choices · Nutrition education · Movement

Explore vitamin D food sources
Elizabeth Miller, ND

Naturopathic Doctor · Vitamin D 101 host

Elizabeth Miller, ND

Elizabeth is a naturopathic doctor based in Ontario, Canada, and the host of Vitamin D 101. She completed undergraduate and graduate study in nutritional and nutraceutical sciences at the University of Guelph before earning her Doctor of Naturopathy degree at the Canadian College of Naturopathic Medicine.

Her academic and clinical interests include digestion, metabolism, and women’s health. In the series, she brings that background to everyday questions about vitamin D, from food and supplements to blood tests and the limits of the research. Her approach treats targeted supplementation as one part of a wider nutritional foundation.

Credentials & professional background

Education

  • Doctor of Naturopathy, Canadian College of Naturopathic Medicine
  • MSc in Nutritional and Nutraceutical Sciences, University of Guelph
  • BSc in Nutritional and Nutraceutical Sciences, University of Guelph

Areas of focus

  • Nutraceutical sciences and nutrition
  • Digestion and metabolism
  • Women’s health
  • Host, Vitamin D 101 video series

Vitamin D 101 · Nutritional science · Research in context

Watch Vitamin D 101

A vitamin D question
you’d like to ask?

Send a general question about food, daily intake, supplement labels, or the research. Our team can help explain the topic and point you toward useful reading.

Ask an expert Explore the guide