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SciShow
We’re Giving Nature a Vitamin Deficiency
Scientists are beginning to notice that more and more species are missing an essential vitamin, one that is crucial for their survival.
Curated Video
Common Vitamin Deficiency Symptoms
Howcast - Learn the most common vitamin deficiency symptoms in this Howcast video
Curated Video
Vitamin Deficiency & Mood Effects
Howcast - Learn how a vitamin deficiency can cause mood issues in this Howcast video