Over 30,000 copies sold - scientifically sound and practical. The book series on Vitamin D, prevention and evolutionary medicine.

Vitamin D - The Shield Against Cancer, Diabetes and Heart Disease
Co-authors: William B. Grant, Ph.D.
The standard work on the role of vitamin D in cancer prevention. With vitamin D barometer and lifestyle risk questionnaire. Shows the connections between sunlight, vitamin D and cancer risk on a scientific basis.

The Most Important Questions and Answers About Vitamin D
Co-authors: Sebastian Weiß
The most current and comprehensive work on vitamin D with over 450 scientific references. Covers the role of vitamin D in COVID-19 and chronic diseases - well-founded and practical.
Compact introduction to the topic of vitamin D deficiency. Explains clearly why so many people are undersupplied and what health consequences this can have.
Co-authors: Sebastian Weiß
Practical guide to optimal vitamin D supply. With concrete instructions for calculating personal needs, information on sun exposure and supplementation.
Co-authors: William B. Grant, Ph.D.
Compact introduction to vitamin D. Explains the key facts about the sun hormone and gives practical tips for optimizing vitamin D levels.
Foundational work on the importance of the sun for human health. Explains the biological mechanisms and the role of vitamin D as a sun hormone.
Practical guide to healthy sun exposure. Shows how to use the positive effects of sunlight without taking risks.
Scientifically based assessment of the pros and cons of UV exposure. Shows why moderate sunbathing is more beneficial to health than harmful.
Shows how an evolutionarily adapted lifestyle can reduce cancer risk. Combines Stone Age nutrition and exercise with modern prevention knowledge.
Critical examination of the diabetes epidemic. Shows how lifestyle and diet can prevent or even reverse diabetes.
Practical guide to making and benefiting from fermented foods. Explains the importance for the microbiome and gut health.