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Nature's Way
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Vitamin D3 (cholecalciferol)
Berlin, winter of 1919. A pediatrician wheels a mercury-vapor lamp beside a child with bowed legs; weeks later, the bones harden and straighten....
Vitamin D3
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Supplement Guide Weak evidence
Glucosamine
In 1876, a young German surgeon dissolved discarded crab shells in acid and crystallized a strange sugar he called "glycosamin." Decades later, the...
Glucosamine hydrochloride
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Hyaluronic Acid
In a 1970s operating room, a surgeon eased a clear, slow-moving gel into a patient's eye. Minutes later, a once-fragile space held steady—an elegant fix born...
Hyaluronic acid