Massive study tests everyday supplements against autoimmune disease and aching knees

This large study looked at whether taking daily vitamin D or fish oil supplements could lower the risk of developing autoimmune diseases (like rheumatoid arthritis), reduce signs of inflammation in the blood, and ease chronic knee pain. Over 25,000 adults without prior cancer or heart disease took part. Researchers measured inflammation markers and tracked new autoimmune cases and knee pain severity over time.