RESEARCH ARTICLES, WITH SELECT QUOTES
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Vitamin D supplementation impact on Knee Osteoarthritis: Data from Osteoarthritis Institute

Vitamin D, osteoarthritis and pain, by Bodyinmind.org

Conclusion: Supplementation with vitamin D over four years was associated with significantly less progression of knee joint abnormalities.

The Link Between Vitamin D And Rheumatoid Arthritis, by Huffington Post

How Vitamin D Affects Rheumatoid Arthritis, by everyday health