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Calcium
In 1808, a young Humphry Davy hooked his new battery to a paste of "lime," boiled off the mercury, and—against all expectations—pulled a silvery metal from...

Iron
In 19th-century clinics, pale teenagers were diagnosed with "green sickness," a languor so common it earned its own pills—iron salts that often turned the...

Magnesium
On a summer day in 1618, a farmer in Epsom, England led his cows to a spring. They refused to drink—too bitter. But when he splashed the water on a rash, it...

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....

Whey protein (concentrate/isolate/hydrolysate) vs Plant protein (pea/soy/rice blends)
Pick whey if you want the most leucine and lean-mass support per scoop and you tolerate dairy; pick plant protein if you're vegan/dairy-sensitive—just use a...

