56% of all adults in Germany suffer from inadequate vitamin D supply, putting them at
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Schwartz JB et al. 2016; Response of vitamin D concentration to vitamin D3 administration in older adults without sun exposure: A randomized double-blind trial; J. Am. Geriatr. Soc. 64(1):65-72 - HEYL
How Does British Weather Affect Your Vitamin D Levels?
2024 Vitamin D Deficiency Statistics of UK Adults
Normal vitamin D levels by age, sources, and toxicity
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Vitamin D (25OH D2 & D3) by Doctor's Data
